Coronaviruses (CoV) are a large family of viruses that cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS-CoV) and Severe Acute Respiratory Syndrome (SARS-CoV). A novel coronavirus (nCoV) is a new strain that has not been previously identified in humans.

Further resources are available online here:

https://openwho.org/courses/introduction-to-ncov
https://www.who.int/emergencies/diseases/novel-coronavirus-2019

Source: openwho.org