World TB Day commemorates 24 March 1882 when Dr Robert Koch discovered what causes tuberculosis. But over a century later the disease kills around 1.7 million people a year.
So what exactly is TB? An infection caused by a bacteria that mainly affects the lungs - although different types can affect other parts of the body.
Tuberculosis symptoms include coughing up blood or phlegm, weight loss and a loss of appetite. The good news is that with treatment of antibiotics TB is relatively straightforward to cure.
The details for the 2015 haven't been confirmed yet but if you want to find out more the World TB Day website has lots of information about events taking place to help raise awareness of TB.