Covid-19 = Corona Virus Disease 2019
SARS-CoV-2 = Severe Acute Respiratory Syndrome
Coronaviruses are not new viruses. Coronaviruses were already discovered in the 1960s. However, the novel coronavirus that is currently responsible for the pandemic is a new, previously unknown strain of the virus. This new type of coronavirus is called SARS-CoV-2 (Severe Acute Respiratory Syndrome).
The disease caused by the SARS-CoV-2 virus is called Covid-19 (Corona Virus Disease 2019). The typical symptoms of this disease are fever, cough, cold, loss of sense of taste and/or smell, shortness of breath, sore throat, headache and pain in the limbs.
Source: https://www.bundesregierung.de/breg-de/themen/coronavirus/informationen-zum-coronavirus-1734932