Load Runner correlation?

HTML Pages often contain dynamic data, which is data that changes each time you access a site.

When you record a script, dynamic data may be recorded into the script. Your script tries to present the recorded variables to the web server, but they are no longer valid. The web server rejects them and issues an error, Using log files we can detect them.
Using correlation we can solve the issue.

Correlation is the way handling dynamic values in client server communication.
The values captured will be send back to server in later steps in the script.
Correlation is typically used for handling session ids
Correlation Techniques:

Manual correlation
Automatic correlation.