Akt is a serine/threonine-specific protein kinase that plays a key role in many cellular processes such as glucose metabolism, apoptosis, cell proliferation, transcription, and cell migration.
Akt is recruited to the membrane by PIP3. Here Akt can be activated / phosphorylated (indirectly) by P13K and can then phosphorylate a variety of downstream pathways. Noteably, Akt promotes cell survival by inhibiting the cell death pathway and stimulates cell metabolism by increasing the utilization of glucose.