How does the use of a load balancer affect user interaction with the system?

A load balancer distributes incoming requests across multiple servers or application instances, which affects user interaction with the system as follows:

• Improved performance and responsiveness: requests are processed faster due to even load distribution.
• Increased fault tolerance: if one server fails, requests are redirected to others, and the user does not notice failures.
• Session and state management: if the load balancer does not support 'sticky sessions' (session affinity), it can cause issues with maintaining user state.

Thus, a load balancer makes interaction more stable and faster but requires proper configuration for correct session and state handling.