sRGB
The standard RGB color space for the web, monitors, and most consumer cameras — covers about 35% of visible colors.
Definition
sRGB (standard RGB) is the default color space for web content, most monitors, and consumer photography. Defined by HP and Microsoft in 1996, it ensures a color rendered as #FF5733 looks roughly the same on every standards-compliant device. Newer wide-gamut spaces (P3, Rec.2020) cover more colors but most browsers and screens still default to sRGB.
Formula
Defined by gamma curve ~2.2 and three primary RGB chromaticities (red, green, blue points on the CIE 1931 chart).
Example
Every hex code on this site is interpreted in sRGB. CSS color() with display-p3 lets you specify wider-gamut colors for capable browsers.