What/who is an apologist?

I don’t think I know what exactly an apologist is. Can you please explain that to me?

*The American Heritage® Dictionary of the English Language * defines “apologist” as “A person who argues in defense or justification of something, such as a doctrine, policy, or institution” (source). So, in a sense, we all are apologists whenever we explain and defend our faith.

Suggested reading:
Practical Apologetics

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