Vaccination Day: India observes National Vaccination Day on March 16. National Vaccination Day or Immunization Day is observed in India every year on March 16. India observes National Vaccination Day to convey to the people of the country the importance of vaccination. For over a hundred and fifty years, vaccines have saved people from diseases that would have hampered progress of humanity. Amid the Covid-19 pandemic, vaccines have brought the world together in a way that we have never seen before. India has emerged a leader in the vaccination drive against the Covid-19 pandemic. What is vaccination and immunization? People often use the two words, vaccination and immunization, interchangeably. But there is a fundamental difference between the two. While vaccination is the act of giving or administering the vaccine, immunization refers to becoming immune to certain diseases after taking the vaccine shot. Vaccination and immunization are very important in a country's basic health care. Timely vaccination prevents two to three million deaths every year from preventable diseases, according to experts.