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The load balancer distributes incoming traffic or requests among multiple servers or resources to ensure high availability and system performance. Main tasks and functions:

• Load distribution: evenly distributes requests so that no server is overloaded.
• Increased fault tolerance: redirects traffic to operational nodes if one server fails.
• Scalability improvement: allows adding or removing servers without service interruption.
• Server status monitoring: checks the availability and functionality of servers.
• Support for various load balancing algorithms: round-robin, least connections, IP-hash, etc.

Example: if you have a web application on three servers, the load balancer will direct user requests so that the load is evenly distributed, and in case of a server failure, traffic will be redirected to the remaining servers.