The H1N1 virus, also known as the swine flu, is a type of influenza virus that can infect both humans and animals. It was first identified in 2009 during a global outbreak and is a combination of genes from different flu viruses, including those found in pigs. Symptoms of H1N1 are similar to regular flu symptoms and can include fever, cough, and body aches. Vaccines are available to protect against the H1N1 virus, and public health organizations like the World Health Organization (WHO) recommend vaccination, especially for high-risk groups. The virus can spread through respiratory droplets when an infected person coughs or sneezes, making hygiene practices important in preventing transmission.