What type of cookies are commonly inserted by advertisers on a website?

Advertisers typically use third-party cookies when inserting tracking mechanisms on a website. These cookies are created by domains other than the one the user is currently visiting. For example, if a user visits a website that has embedded content or ads from an external provider, that external server can set a cookie to track the user's behavior across different sites. This tracking ability helps advertisers gather data about user preferences and behaviors, enabling targeted advertising based on the user's browsing history across multiple sites.

In contrast, first-party cookies are set by the website the user is actively visiting and are generally used to enhance the user experience, such as keeping users logged in or remembering language preferences. Session cookies are temporary and are deleted when the user closes their browser, often used for maintaining session state during a visit. Persistent cookies remain on a user's device for a specified period, usually used for remembering user preferences, but they are not specifically designed for tracking across different websites. Third-party cookies are distinct in their purpose and impact on online advertising strategies.