The term FILTER TARGET refers to the process of filtering out unwanted emails, such as spam and junk mail. The crossword solutions for this term are SPAM (4 letters) and JUNKEMAIL (9 letters). Spam is unsolicited email sent in bulk, usually for commercial purposes, while junk mail is a form of spam that contains advertisements or other unwanted content. Both types of emails can be filtered out using various techniques, such as keyword filtering, IP address blocking, and content analysis.