T cells and antigen presenting cells (APC) form a specialized cell-cell junction termed the immunological synapse (IS). It is characterized by a central region of antigen receptors, a ring of integrin family adhesion molecules, and temporal stability over hours. This minireview discusses the current knowledge on the formation, function and diversity of immunological synapses. Cytoskeletal remodeling in T cells, which is connected with signals delivered by costimulatory molecules, plays a crucial role in a formation of IS.