YouTube uses various cookies and local storage to track user interactions with its content. The most common ones include:
* Session-based cookies like ‘ySc’, ‘YSC’, ‘yt.innertube::nextId’ and ‘yt-remote-cast-installed’, which expire after a single session, typically when the browser is closed.
* Persistent cookies such as ‘VISITOR_INFO1_LIVe’, ‘yt-remote-fast-check-period’, and ‘ytidb::LAST_RESULT_ENTRY_KEY’ that can last up to 180 days.
* Local storage like ‘ytidb::databases’, which stores user preferences, and others that track device information.
These cookies are used for various purposes such as:
* Registering unique IDs to keep statistics of what videos the user has seen
* Tracking user’s interaction with embedded content
* Estimating users’ bandwidth on pages with integrated YouTube videos
* Implementing and functioning of YouTube video content on websites
Source: https://www.sammobile.com/news/samsung-galaxy-s25-march-2025-security-update