Which software component enhances a computer browser by adding functions like video viewing?

A plugin is the software component that enhances a computer browser by adding functions such as video viewing. It enables the browser to access and display multimedia content that it would not be able to handle natively. For instance, video plugins allow users to watch streaming videos directly in the browser without needing to download additional software or applications. This functionality is particularly important for a seamless user experience when engaging with various online media.

Plugins can also provide other enhancements, such as interactive features, additional security, or integration with other services, thereby increasing the overall capability of the browser. This makes them essential for users who wish to maximize their web experience across different types of content. Other choices, while related to computer functionality, do not specifically enhance the browser in the same way plugins do. Drivers relate to hardware interaction, antivirus software focuses on security and protection against malware, and the operating system manages system resources and provides essential functionalities but does not directly add browser features like plugins do.