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A background check is a process a person or company uses to verify that an individual is who they claim to be, and this provides an opportunity to check and confirm the validity of someone's criminal record, education, employment history, and other activities from their past. (Wikipedia)

Employers conduct a background check to ensure they are hiring the right candidate for their organisation. (Indeed)

If you did work that is not listed on the application and it is discovered during a background check, it can put an offer in jeopardy. (BBC)

The background check uses third-party resources to look into public records, law enforcement, credit bureaus, academic records and previous work history. (Forbes)