Acronym for Internet Security Association and Key Management Protocol.
A protocol utilizing security concepts necessary for establishing Security Associations (SA) and cryptographic keys inan Internet environment. ISAKMP negotiates, establishes, modifies and deletes Security Associations and their attributes. It defines the procedures for authenticating a communicating peer, creation and management of Security Associations, key generation techniques, and threat mitigation (e.g. denial of service and replay attacks). All of these are necessary to establish and maintain secure communications (via IPSec or any other security protocol) in an Internet environment.
Defined in 
RFC:2408.
3 pages link to ISAKMP:
