This document discusses cookies and log files. Cookies are small pieces of data stored in text files that customize webpages for users by storing single pieces of data under unique IDs. They can be session cookies that delete when the browser closes or persistent cookies that expire after a period of time. Log files record events and software runs to diagnose problems by recording client requests to servers. The document outlines the types of cookies, where they are stored, their uses and limitations as well as providing an overview and discussion of privacy issues and the syntax of log files.