What is Keyword Difficulty?

I see in SEO ..........there is a keyword research tool which show keyword difficulty.............

I want to know about keyword difficulty and what i understood after seeing this result
 
Keyword Inspector is a free Keyword Difficulty Analysis tool used to analyse difficulty in ranking a keyword. It is a product of Learn2Rank.com and does keyword difficulty analysis for you.
 
Ranking for high-volume keywords is every SEO practitioner's dream. By sorting results according to difficulty in ascending or descending order, you'll be able to discover the most and least competitive keywords. The data can be sorted by difficulty, volume or results.
 
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