In category-based rounds of invitations, we invite candidates in the Express Entry pool who are eligible for a specific category established by the Minister to meet an identified economic goal. We invite candidates to apply for permanent residence based on criteria such as

  • ability to communicate in a specific official language
  • work experience in a specific occupation
  • education

Category-based rounds add to general and program-specific rounds by inviting top-ranking candidates who can help us meet these specific economic goals.
We’ll announce the chosen categories in advance.

Read more here: https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/express-entry/submit-profile/rounds-invitations/category-based-selection.html