Hi @vikram1583,
You can go through below docs... this might help you to get a clear idea about the logs
https://docs.splunk.com/Documentation/Splunk/7.2.4/Data/AboutWindowsdataandSplunk
https://docs.splunk.com/Documentation/UnixApp/5.2.5/User/Whatdataarecollected
My I know all this about in a small description