When we use to Add Logs Activity? If we have Log Message Activity

when we use Add Log Field if we have a Log Message Activity.
@Palaniyappan

It can be used to add custom fields to the logs if the default ones do not log all of the data that you want.

can you explain more. Not getting it clearly

The logs by default have the following fields:

message
level
logType
timeStamp
fingerprint
windowsIdentity
machineName
processName
processVersion
jobId
robotName
machineId
fileName

You can use the Add Log Fields activity to add more fields to subsequent logs. Like if for some reason you wanted a timestamp from a different time zone you could add that in.