The noun jargon can be countable or uncountable. In more general, commonly used, contexts, the plural form will also be jargon. However, in more specific contexts, the plural form can also be jargons e.g. in reference to various types of jargons or a collection of jargons.

Is there such a word as jargon?

Jargon is "the technical terminology or characteristic idiom of a special activity or group".

What is an example of a jargon?

Some examples of jargon include: Due diligence: A business term, "due diligence" refers to the research that should be done before making an important business decision. AWOL: Short for "absent without leave," AWOL is military jargon used to describe a person whose whereabouts are unknown.