What are the very small files called that websites use to track a user's actions and information?

The term for the very small files that websites use to track a user's actions and information is tracking cookies. These are specifically designed to collect data on user behavior, preferences, and browsing habits. When a user visits a website, these cookies are stored on their device and can later be retrieved by that website to enhance user experience, provide personalized content, or deliver targeted advertisements.

Tracking cookies differ from cache files, which are temporary storage locations that hold copies of web pages and resources to improve loading times. Session logs refer to records of user activity during a single session and do not necessarily involve storing information on the user's device. Local storage is another method for storing data within the user's browser but is typically used for larger amounts of data that web applications can access rather than tracking specific user actions.

Therefore, understanding the purpose of tracking cookies is crucial, as they play a significant role in online user experience and data collection practices utilized by businesses and websites.