What does the term nutshell mean?

Answer 1

That's a term meaning 'the short version' of a particular explanation or story, many times leaving out mitigating details.
It means "in a few words"
When someone says in a nutshell, it generally means a summary of something, or a short version of a story. For example:

"What is the problem?"

"In a nutshell, I had a bad day."

Answer 2

In a nutshell, is a short, concise description of something. It is usually said before the summary is made. Instead of explaining every single detail you make a concise summary. Example; In a nutshell, we make the 2:00 train or we'll be late.
To simplify, to reduce it down to something you can easily see and understand. Other expressions: In short. To summarize. Simply put. In general. Other slang: To make a long story short. Nuts and bolts. Under the skin. Without all the bells and whistles.

Answer 3

"In a nutshell" is a metaphor, and is another way of saying "to explain simply" or "to explain briefly."

Answer 4

In a nutshell is a term that people use when they want to shorten a long story. It means to be concise and use as few words as possible. In other words, it is a brief summary of a long story.