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, also known as SARS-CoV-2) is a new strain that has not been previously identified in humans. The disease caused by this novel coronavirus is then named Coronavirus Disease 2019(COVID-19) by WHO.
Standard recommendations to prevent infection spread include regular hand washing, covering mouth and nose when coughing and sneezing, thoroughly cooking meat and eggs. Avoid close contact with anyone showing symptoms of respiratory illness such as coughing and sneezing.
More information can be found on WHO website, CDC website.