EPOC Kernel Architecture 2 (EKA2) is the second (the latest at the moment) version of Symbian OS kernel. Its predecessor is EPOC Kernel Architecture 1 (EKA1). Symbian has EKA2 kernel from version 8.1a and onward. The main difference between EKA1 and EKA2 is that EKA2 is real-time when EKA1 did not provide real-time guarantees.