Port

1. Interface on an internetworking device (such as a router). 2. In IP terminology, an upper-layer process that receives information from lower layers. Ports are numbered, and each numbered port is associated with a specific process. For example, SMTP is associated with port 25. A port number is also called a well-known address. 3. To rewrite software or microcode so that it runs on a different hardware platform or in a different software environment than that for which it was originally designed.