__________are text files with small pieces of data and are used to identify specific users and improve the web browsing experience.

The correct option is Cookies.

Step-by-Step Explanation:

1. Understanding the definition: Cookies are small text files that websites send to a user's device (computer, tablet, or smartphone) while they are browsing. These files store small pieces of data, such as login information, preferences, or shopping cart items.
2. Purpose of Cookies: They are primarily used to identify specific users and track their activity on a website. This helps in customizing and improving the web browsing experience by remembering user settings, keeping users logged in, and providing personalized content.
3. Analyzing the other options:
- Bookmarks: These are shortcuts stored by the browser to quickly access favorite websites, not data files sent by servers to identify users.
- Blogs: These are informational websites or online journals consisting of discrete, often informal diary-style text entries.
- Wikis: These are collaborative websites that allow users to create and edit content collectively.
Therefore, the term that fits the description perfectly is "Cookies".