To give you an idea of what Squid is, we will reproduce the following bullets from Squid's home page (http://www.squid-cache.org/):
Squid is...
A full-featured web proxy cache
Designed to run on Unix systems
Free, open source software
The result of many contributions by unpaid volunteers
Funded by the National Science Foundation
Squid supports...
Proxying and caching of HTTP, FTP, and other URLs
Proxying for SSL
Cache hierarchies
ICP, HTCP, CARP, and Cache Digests
Transparent caching
WCCP (Squid v2.3)
Extensive access controls
httpd server acceleration
SNMP
Caching of DNS lookups
 
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