What is load balancing ?

Load balancing refers to efficiently distributing incoming network traffic across a group of back-end servers, also known as a “server farm” or “server pool”.

In IT terms it's a way to distribute network traffic equally (or as weighted) on more than one nodes thus providing quick service to the clients.

load balancing means to allow the traffic in such a way the network may not come down. most of the protocols do load balancing.

it is a I.T network term.the ability to balance network(LAN or WAN) bandwidth with or without the support of a routing protocol or a device

Load balancing is a technique to divide the Network Load between two or many devices

A load balancer is a device that acts as distributes network or application traffic across a number of servers, Load balancer are used to increase capacity and reliability of applications. 

Using multiple network traffic paths to avoid traffic congestion.

Very good question.

I think my answer will exactly as Mr. Sayed Javed answer.

The concept of load balancing is to use the extra paths which are usable and not to put all the load on only one path.

Load balancing is a core networking solution responsible for distributing incoming traffic among servers hosting the same application content. By balancing application requests across multiple servers, a load balancer prevents any application server from becoming a single point of failure, thus improving overall application availability and responsiveness. For example, when one application server becomes unavailable, the load balancer simply directs all new application requests to other available servers in the pool.

Load balancers also improve server utilization and maximize availability. Load balancing is the most straightforward method of scaling out an application server infrastructure. As application demand increases, new servers can be easily added to the resource pool, and the load balancer will immediately begin sending traffic to the new server.

Load Balancing is a network solution that distributes the traffic efficiently across a a pool of back end servers.