A definition of sRGB

Standard RGB. A colour space developed by HP and Microsoft for computer hardware, such as monitors, scanners and printers. sRGB has been widely adopted as the default colour space for most cameras, scanners and other imaging devices, and in cameras it's typically offered as an option alongside the AdobeRGB standard. It has a slightly narrower gamut than Adobe RGB, although this concentrates colours for more pleasing reproduction on devices which cannot support the full AdobeRGB space.