What is Browser thread? How does Browser threads impact the performance?

Browser threads: A thread is a path of execution through an application. In the case of web browsers, this path consists of sending a request, receiving the response and displaying the object. Each thread operates independently.

• Single-threaded mode is used when a web browser executes a Java script that communicates continually with a web server, or more generally, when a client application other than a web browser is employed.
• Load testing tools need to have the ability to accurately emulate web browsers in both single and multi threaded modes in order to apply realistic workloads to the web applications being tested.