Every year we honor the legacy of Martin Luther King Jr. in January. Here's everything you need to know about the holiday.

Martin Luther King Jr., a reverend and civil-rights activist, was assassinated at 39. However, he inspired several movements and political changes.

Martin Luther King Jr. Day falls on Monday, Jan. 20, and in the spirit of the late civil rights leader, the days around the holiday will be packed with opportunities for people to serve and give back to their communities in the D.