Granitic rocks originate from a variety of sources, ranging from pure mantle to pure crust, and their composition is closely linked to tectonic settings. Granites from ocean ridges typically have depleted mantle sources, while those from volcanic arcs show a mix of depleted mantle and subducted oceanic crust. Intraplate granites often have enriched mantle sources with some crustal contribution, and syn-collision granites are usually from pure crustal or mantle sources with subducted crustal components. Post-collision granites show enriched lithospheric mantle sources with rare crustal melts. The interaction between mantle-derived magmas and crust is influenced by crustal thickness, temperature, and magma residence time, which are related to tectonic settings. These relationships allow for the geochemical fingerprinting of granites, which, combined with geological data, helps determine their tectonic setting. Granites are defined as coarse-grained igneous rocks with more than 5% quartz, with sources being the mantle or crustal protoliths contributing to the magma. Settings are the global tectonic environments where the magma forms. Granitic magma sources are primarily mantle and crust, but most granites result from a mixture of both. The variability in granite composition is due to differences in source composition, melting degree, and interactions between mantle and crust. Mantle sources vary in composition, with the depleted mantle (DMM) being the main reservoir, but it can be mixed with enriched mantle. Mantle lithosphere can be ultra-depleted or enriched, and melting can occur without direct melting. Mantle melting is partial and fractional, with varying degrees of melting leading to different magma types. Crustal sources vary by rock type and depth, with igneous and sedimentary protoliths being the main categories. Crustal melting involves partial melting and separation of melt from residue, with composition influenced by crustal composition and residue nature. Volatile fluxing can cause intracrustal melting and transport elements into melting regions. Mantle-crust interaction involves subduction components, such as aqueous fluids and siliceous melts, which can modify magma composition. Processes like MASH (magma, assimilation, segregation, homogenisation) and AFC (assimilation, fractional crystallisation) are key in granite formation. Tectonic settings include mid-ocean ridges, volcanic arcs, within-plate settings, collision settings, and post-collision settings, each with distinct geochemical characteristics. The Rb-(Y+Nb) diagram is a key tool for distinguishing tectonic settings of granites, reflecting sources and processes. Ocean ridge granites have low Rb and high Y+Nb, while volcanic arc granites have higher Rb and lower Y+Nb. Within-plate granites have high Rb and Nb, and collision granites show a wide range of compositions. Post-collision granites are the most difficult to classify due to aGranitic rocks originate from a variety of sources, ranging from pure mantle to pure crust, and their composition is closely linked to tectonic settings. Granites from ocean ridges typically have depleted mantle sources, while those from volcanic arcs show a mix of depleted mantle and subducted oceanic crust. Intraplate granites often have enriched mantle sources with some crustal contribution, and syn-collision granites are usually from pure crustal or mantle sources with subducted crustal components. Post-collision granites show enriched lithospheric mantle sources with rare crustal melts. The interaction between mantle-derived magmas and crust is influenced by crustal thickness, temperature, and magma residence time, which are related to tectonic settings. These relationships allow for the geochemical fingerprinting of granites, which, combined with geological data, helps determine their tectonic setting. Granites are defined as coarse-grained igneous rocks with more than 5% quartz, with sources being the mantle or crustal protoliths contributing to the magma. Settings are the global tectonic environments where the magma forms. Granitic magma sources are primarily mantle and crust, but most granites result from a mixture of both. The variability in granite composition is due to differences in source composition, melting degree, and interactions between mantle and crust. Mantle sources vary in composition, with the depleted mantle (DMM) being the main reservoir, but it can be mixed with enriched mantle. Mantle lithosphere can be ultra-depleted or enriched, and melting can occur without direct melting. Mantle melting is partial and fractional, with varying degrees of melting leading to different magma types. Crustal sources vary by rock type and depth, with igneous and sedimentary protoliths being the main categories. Crustal melting involves partial melting and separation of melt from residue, with composition influenced by crustal composition and residue nature. Volatile fluxing can cause intracrustal melting and transport elements into melting regions. Mantle-crust interaction involves subduction components, such as aqueous fluids and siliceous melts, which can modify magma composition. Processes like MASH (magma, assimilation, segregation, homogenisation) and AFC (assimilation, fractional crystallisation) are key in granite formation. Tectonic settings include mid-ocean ridges, volcanic arcs, within-plate settings, collision settings, and post-collision settings, each with distinct geochemical characteristics. The Rb-(Y+Nb) diagram is a key tool for distinguishing tectonic settings of granites, reflecting sources and processes. Ocean ridge granites have low Rb and high Y+Nb, while volcanic arc granites have higher Rb and lower Y+Nb. Within-plate granites have high Rb and Nb, and collision granites show a wide range of compositions. Post-collision granites are the most difficult to classify due to a