What is difference between concurrent users and simultaneous users?

Question

Accepted Answer

Concurrent users and simultaneous users are often used interchangeably, but they have different meanings.

Concurrent users refer to the number of users accessing the system at the same time.
Simultaneous users refer to the number of users performing the same action at the same time.
Concurrent users can perform different actions at the same time, while simultaneous users perform the same action.
For example, if 100 users are accessing a website at the same time, they are concurrent users. If 50 of those users are clicking on the same button at the same time, they are simultaneous users.

Accepted Answer

whoever keeping the load against application .those users are called the concurrent users.

whoever performance same transactions at a same time those users are called simultaneous users.

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