Like other load balancers, Elastic Load Balancer(ELB) also receives incoming traffic from the clients and distribute it among multiple instances(Servers).
Elastic Load Balancer is used to make an application highly available.Elastic Load Balancer continuously does a health check of all instances and routes the traffic to only healthy instances.
Elastic Load Balancers are of three types:
1) Classic Load Balancer (CLB)
2) Application Load Balancer (ALB)
3) Network Load Balancer (NLB)
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https://devopsmyway.com/aws-elastic-load-balancer/