One benefit of cookies is that they:

Cookies play a significant role in enhancing user experience on the web, and one of their main benefits is how they simplify online data entry. When a user visits a website that utilizes cookies, the website can store information about that user, such as login credentials or form inputs. This stored data allows for quicker and easier access during subsequent visits; the user won’t need to re-enter the same information, as the website can automatically retrieve and populate those fields using the cookie data. This functionality leads to a more efficient and user-friendly experience, especially on sites requiring repeated interactions, like e-commerce platforms or social networks, where frequent logins or form submissions are common.

While tracking browsing behavior is an aspect of cookies, which allows for personalized content and advertisements, that functionality isn't as directly related to enhancing user convenience as the simplification of data entry. Similarly, while cookies can play a part in website security by storing secure session tokens, their primary purpose is not security-focused. Lastly, cookies have no direct role in facilitating email communication. Thus, the option regarding the simplification of online data entry accurately captures a fundamental and beneficial aspect of cookies.