What is the use of Limit class in Salesforce?

Hi,

The Limits methods in Limit class return the specific limit for the particular governor, such as the number of calls of a method or the amount of heap size remaining.

You can take help of below link for further information-

https://developer.salesforce.com/docs/atlas.en-us.apexcode.meta/apexcode/apex_methods_system_limits.htm

Thanks.