A Covid-19 Recovery Certificate, also known as Proof of Covid Recovery, a Covid Recovery Letter or Proof of Natural Immunity, confirms that you have recently had Covid-19 and have recovered so are likely to be protected against Coronavirus by your antibodies. It's most commonly used for entry to destinations that accept Covid-19 Recovery Certificates as an alternative to Fit to Fly Certificates, which show that you were unlikely to have Covid-19 on the date of your test.
Covid-19 Recovery Certificates also enable travel for passengers who have recovered from Covid-19 but may continue to test positive for Coronavirus despite showing no symptoms.
You'll need to upload a positive Covid-19 test result and demonstrate that you've recovered from Covid-19 during the application process to be eligible for a Recovery Certificate. If your application is approved, you'll need to show your positive Covid-19 test result alongside your Covid-19 Recovery Certificate when you travel for entry to your destination.