Tax Credits can reduce the amount of tax you owe or increase your tax refund, and some credits may give you a refund even if you don't owe any tax, and those Tax credits are known as refundable Tax Credits. Examples of Tax credits include:
Child Tax Credit
Reconcile advance payments of the Child Tax Credit on your 2021 tax return
Does my child/dependent qualify for the Child Tax Credit or the Credit for Other Dependents?
Publication 8812, Credits for Qualifying Children and Other Dependents
Dependent Care Credit
Tax Credit with Dependents
Other Child Credit
2021 Recovery Rebate Credit
To find out if your dependents qualify, see Questions 7-9 in Recovery Rebate Credit Eligibility FAQs
Income and Savings Credits
Homeowner Credits
Health Care Credits
Education Credits