WEAVE, the new wide-field, massively multiplexed spectroscopic survey facility for the William Herschel Telescope, saw first light in late 2022. WEAVE comprises a new 2-deg field-of-view prime-focus corrector system, a nearly 1000-multiplex fibre positioner, 20 individually deployable 'mini' integral field units (IFUs), and a single large IFU. These fibre systems feed a dual-beam spectrograph covering the wavelength range 366-959nm at R similar to 5000, or two shorter ranges at . After summarizing the design and implementation of WEAVE and its data systems, we present the organization, science drivers, and design of a five- to seven-year programme of eight individual surveys to: (i) study our Galaxy's origins by completing Gaia's phase-space information, providing metallicities to its limiting magnitude for similar to 3 million stars and detailed abundances for similar to 1.5 million brighter field and open-cluster stars; (ii) survey similar to 0.4 million Galactic-plane OBA stars, young stellar objects, and nearby gas to understand the evolution of young stars and their environments; (iii) perform an extensive spectral survey of white dwarfs; (iv) survey similar to 400 neutral-hydrogen-selected galaxies with the IFUs; (v) study properties and kinematics of stellar populations and ionized gas in z < 0.5 cluster galaxies; (vi) survey stellar populations and kinematics in field galaxies at 0.3 less than or similar to z less than or similar to 0.7; (vii) study the cosmic evolution of accretion and star formation using >1 million spectra of LOFAR-selected radio sources; and (viii) trace structures using intergalactic/circumgalactic gas at z > 2. Finally, we describe the WEAVE Operational Rehearsals using the WEAVE Simulator. C1 [Jin, Shoko; Dalton, Gavin B.; Molaeinezhad, Alireza; Gilbert, James; Hughes, Sarah; Jarvis, Matt J.; Lewis, Ian J.; Schallig, Ellen] Univ Oxford, Oxford Astrophys, Keble Rd, Oxford OX1 3RH, England. [Jin, Shoko; Trager, Scott C.; Hess, Kelley M.; Balbinot, Eduardo; Helmi, Amina; Matsuno, Tadafumi; Peletier, Reynier F.; Starkenburg, Else; Tolstoy, Eline; Verheijen, Marc A. W.; Verro, Kristiina] Univ Groningen, Kapteyn Astron Inst, Landleven 12, NL-9747 AD Groningen, Netherlands. [Jin, Shoko; Dalton, Gavin B.; Guest, Steve; Terrett, David; Bishop, Georgia] STFC, RALSpace, Didcot OX11 0QX, England. [Jin, Shoko] SRON Netherlands Inst Space Res, Landleven 12, NL-9747 AD Groningen, Netherlands. [Aguerri, J. 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M.; Hardcastle, Martin J.; Harris, Amy] Univ Hertfordshire, Ctr Astrophys Res, Hatfield AL10 9AB, Herts, England. [Drew, J. E.; Wesson, Roger] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England. [Gaensicke, Boris T.; Hoskin, Matthew J.; Fusillo, Nicola Gentile] Univ Warwick, Dept Phys, Gibbet Hill Rd, Coventry CV4 7AL, England. [Hill, Vanessa; Bernard, Edouard J.; Kordopatis, Georges; Maurogordato, Sophie; Peirani, Sebastien; Schultheis, Mathias; Wegg, Christopher] Univ Cote Azur, CNRS, Observ Cote Azur, Lab Lagrange, Bd Observ,CS 34229, F-06304 Nice 4, France. [Iovino, Angela; Longhetti, Marcella; Fossati, Matteo; Haines, Christopher P.; Lonoce, Ilaria; Morelli, Lorenzo] INAF Osservatorio Astron Brera, Via Brera 28, I-20121 Milan, Italy. [Pieri, Matthew M.; Morrison, Sean; Perez-Rafols, Ignasi; Blomqvist, Michael; Bosma, Albert] Aix Marseille Univ, CNRS, CNES, LAM,Lab Astrophys Marseille, F-13388 Marseille, France. 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[Antoja, Teresa; Monguio, Maria; Romero-Gomez, Merce; Balaguer-Nunez, Lola; Cantat-Gaudin, Tristan; Castro-Ginard, Alfred; Carbajo-Hijarrubia, Juan; Figueras, Francesca; Jordi, Carme; Miralda-Escude, Jordi; Ramos, Pau] Inst Estudis Espacials Catalunya IEEC, C Gran Capita 2-4, Barcelona 08034, Spain. [Aragon-Salamanca, Alfonso; Cornwell, Daniel J.; Hatch, Nina A.; Kuchner, Ulrike; Read, Shaun C.] Univ Nottingham, Sch Phys & Astron, Univ Pk, Nottingham NG7 2RD, England. [Ascasibar, Yago] Univ Autonoma Madrid, Dept Fis Teor, Madrid 28049, Spain. [Babusiaux, Carine] Univ Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France. [Babusiaux, Carine; Bonifacio, Piercarlo; Royer, Frederic; Caffau, Elisabetta; Casamiquela, Laia; Di Matteo, Paola; Haywood, Misha; Jablonka, Pascale] Univ PSL, CNRS, GEPI, Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France. [Bensby, Thomas; Feltzing, Sofia; Feuillet, Diane] Lund Observ, Dept Astron & Theoret Phys, Box 43, SE-22100 Lund, Sweden. 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[Berlanas, Sara R.; Wright, Nicholas J.] Keele Univ, Astrophys Grp, Keele ST5 5BG, England. [Bianco, Andrea; De Grandi, Sabrina; Dutta, Rajeshwari; Longobardi, Alessia; Rainer, Monica] INAF Osservatorio Astron Brera, Via Bianchi 46, I-23087 Merate, LC, Italy. [Bonoli, Silvia] Donostia Int Phys Ctr, Paseo Manuel Lardizabal 4, San Sebastian 20018, Spain. [Bonoli, Silvia] Basque Fdn Sci, IKERBASQUE, Plaza Euskadi 5, Bilbao 48009, Spain. [Castro-Ginard, Alfred; Rossi, Elena Maria; Roettgering, Huub J. A.; Stuik, Remko; van Weeren, Reinout J.; Williams, Wendy L.] Leiden Univ, Leiden Observ, Niels Bohrweg 2, NL-2333 CA Leiden, Netherlands. [Couto, Guilherme; Lam, Man I.; Walcher, C. Jakob] Leibniz Inst Astrophys Potsdam, Sternwarte 16, D-14482 Potsdam, Germany. [Casamiquela, Laia; Soubiran, Caroline] Univ Bordeaux, CNRS, Lab Astrophys Bordeaux, B18N Allee Geoffroy St Hilaire, F-33615 Pessac, France. 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[Dutta, Rajeshwari; Fossati, Matteo; Fumagalli, Michele; Longobardi, Alessia] Univ Milano Bicocca, Dipartimento Fis G Occhialini, Piazza Sci 3, I-20126 Milan, Italy. [Erkal, Denis] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England. [Fumagalli, Michele] INAF Osservatorio Astron Trieste, Via Giambattista Tiepolo 11, I-34131 Trieste, TS, Italy. [Gebran, Marwan] St Marys Coll, Dept Chem & Phys, Notre Dame, IN 46556 USA. [Gilbert, James] Mt Stromlo & Siding Spring Observ, Res Sch Astron & Astrophys, Cotter Rd, Weston, ACT 2611, Australia. [Greimel, Robert] Graz Univ, Inst Phys, Univ Pl 5, A-8010 Graz, Austria. [Guarcello, Mario Giuseppe] INAF Osservatorio Astron Palermo, Piazza Parlamento 1, I-90134 Palermo, Italy. [Guerra, Jose; Hernandez, Nauzet; Lodi, Marcello; San Juan, Jose] INAF Fdn Galileo Galilei, Rambla Jose Ana Fernandez Perez 7, Brena Baja 38712, Tenerife, Spain. [Irsic, Vid] Univ Cambridge, Kavli Inst Cosmol, Madingley Rd, Cambridge CB3 0HA, England. 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[Vink, Jorick S.] Armagh Observ & Planetarium, Coll Hill, Armagh BT61 9DG, North Ireland. [Vioque, Miguel] Joint ALMA Observ, Alonso Cordova 3107, Santiago 7630355, Chile. [Vioque, Miguel] Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA. [Vioque, Miguel] Univ Leeds, Sch Phys & Astron, Sir William Henry Bragg Bldg, Leeds LS2 9JT, England. [Weijmans, Anne-Marie] Univ St Andrews, Sch Phys & Astron, North Haugh, St Andrews KY16 9SS, Scotland. [Xylakis-Dornbusch, Theodora] Heidelberg Univ, Landessternwarte, Zentrum Astron, Konigstuhl 12, D-69117 Heidelberg, Germany. [Dorda, Ricardo] Univ Europea Canarias, Sch Architecture, C Inocencio Garcia, La Orotava 38300, Tenerife, Spain. [Britavskiy, Nikolay] Univ Liege, GAPHE Inst Astroph & Geoph, Allee 6 Aout 19c, B-4000 Liege, Belgium. 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