Hi,
look up round-robin DNS online. It is a cheap method for load balancing.
For example, you got 2 IP addresses for website "test.com". When you try to access it, it will return IP1, and when I try to access it, it will return IP2.
There are some interesting information in this post also. Feel free to take a look, maybe you'll find it useful:
https://webmasters.stackexchange.com/questions/10927/using-multiple-a-records-for-my-domain-do-web-browsers-ever-try-more-than-one
Hopefully I cleared it out a bit for you.
Kind regards,
Domagoj Novak