Express Entry is Canada’s application management system for three immigration programs: the Federal Skilled Worker Program (FSWP); Canadian Experience Class (CEC); and Federal Skilled Trades Program (FSTP).
Candidates who have self-determined that they are eligible for Express Entry will first indicate to the Canadian government their expression of interest in obtaining Canadian permanent resident status.
https://www.cicnews.com/2024/01/what-needs-to-be-included-in-a-complete-express-entry-application-for-permanent-residence-0142372.html#gs.42d46j