Application Layer definition in Computer Security terms:
Definition(s): Layer of the TCP/IP protocol stack that sends and receives data for particular applications such as DNS, HTTP, and SMTP.
Source(s): NIST SP 800-113
Represents deployed software applications that are targeted towards end-user software clients or other programs, and made available via the cloud.
Source(s): NIST SP 800-144
reference: CSRC Glossary