What is the difference between @timestamp and timestamp?

The timestamp field usually have a "@" prefix. Why? What is the difference if we do not add it ?

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@ fields are usually ones generated by Logstash as metadata ones, @timestamp being the value that the event was processed by Logstash.

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Hi Mark

Nice to see you. Thanks for your answer. So it means we can change the @timestamp to timestamp if we want, right?
As long as we are not using logstash

If you want, yes.

Thanks very much. I posted another question here

Is it possible for you to have a look also? Thanks very much