What is corona viruses short definition?

Coronaviruses are a group of related RNA viruses that cause diseases in mammals and birds. In humans, they can cause respiratory infections ranging from the common cold to more severe diseases such as Severe Acute Respiratory Syndrome (SARS) and Middle East Respiratory Syndrome (MERS). The most recently discovered coronavirus, SARS-CoV-2, is responsible for the ongoing COVID-19 pandemic.