Signature file explained

Signature files are computer files of some kind of signature data, such as:

• A file containing signature values to be used in signature-based detection of viruses
• In document retrieval, a quick and dirty filter that keeps all the documents that match to the query.
• A signature block, or sig file is a block of text automatically appended at the bottom of an email message.
• A file containing a digital signature
• Electronic signature