Separating your keywords into several categories allows for a more detailed analysis. For example, if you run an e-commerce site, grouping your keywords according to your product categories will allow you to know which category is likely to perform best or which has the best potential.

You can create your categories manually and move the keywords you want into these groups like this:
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But you can also use the automatic categorisation option. This option allows you to automatically group expressions into groups according to their terminology.
You will therefore have pre-made groups, with the number of keywords contained in the group in red. Click on a category to take it into account.