Template Variables in Connectors

Is there any blog available on utilization of Template Variables in connectors?
I am unable to understand application of it? Can you please explain it to me with example? or please provide any reference available.
Currently I am looking at ${timestamp} template variable of Oracle CDC connector available in confluent itself. There are many such template variables right, which I believe are assigned as an object and can be used as regex pattern in SMT or conditioning topic names, etc. I am not sure on my thoughts. Please help me to get it, Please provide application of ${timestamp} if possible.
Thank you so much.

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