TIAM2, also known as T-lymphoma invasion and metastasis-inducing protein 2, is a key member of the TIAM family of guanine nucleotide exchange factors (GEFs). Primarily located in the cytoplasm, TIAM2 is essential for regulating cellular processes, especially those involving cytoskeletal dynamics, cell migration, and invasion. A defining feature of TIAM2 is its role as a molecular switch for activating Rho GTPases, particularly Rac1. Through its GEF activity, TIAM2 facilitates the exchange of GDP for GTP on Rac1, triggering downstream signalling pathways that control actin cytoskeleton rearrangements.