Font Awesome is a large, single-vendor icon system: roughly 2,000 free icons (Solid, Regular, and Brands styles) plus a paid Pro tier expanding to 7,800+ icons across Light, Duotone, Thin, and Sharp styles.
Being built in-house by one team rather than aggregated keeps the whole family visually consistent even as it scales into thousands of icons across many styles, a size-and-consistency combination aggregators cannot match.
Good default choice for teams wanting broad category coverage and multiple weight or style options from a single vendor rather than mixing several smaller free sets.
Free icons are technically CC BY 4.0 (attribution required, though rarely enforced in practice); Pro removes that requirement and costs roughly $120/year, delivered as SVG or a web font with framework packages for React, Vue, and others.
The web's most popular icon set and toolkit.
