Involved in cell adhesion. Contributes to integrin activation. When coexpressed with talin, potentiates activation of ITGA2B. Required for normal keratinocyte proliferation. Required for normal polarization of basal keratinocytes in skin, and for normal cell shape. Required for normal adhesion of keratinocytes to fibronectin and laminin, and for normal keratinocyte migration to wound sites (By similarity). Interacts with the cytoplasmic domain of integrins ITGB1 and ITGB3. Colocalizes with filamentous actin. Constituent of focal adhesions (By similarity). Localized at the basal aspect of skin keratinocytes, close to the cell membrane (By similarity). Upon TGFB1 treatment, it localizes to membrane ruffles (By similarity). The FERM domain is not correctly detected by PROSITE or Pfam techniques because it contains the insertion of a PH domain. The FERM domain contains the subdomains F1, F2 and F3. It is preceded by a F0 domain with a ubiquitin-like fold. The F0 domain is required for integrin activation and for localization at focal adhesions (By similarity). Belongs to the kindlin family.