What is the error 503 Error?

Nowadays, everyone uses the internet and we frequently switch from one website to another. Some of us get the error during the visit of sites. These errors are like 503, 404 and other. In this, 503 error is the most common error in this. Well, this is not the client side error, it is server side error. Means the error is not caused by the frontend or UI park is caused due to the backend, which is unable to process the client request or simple meaning is Service Unavailable.
For for information :- https://techyvibe.net/503-error/