Definition - What does Joint Resolution mean?
A joint resolution is a measure generated and approved by the U.S. House of Representatives and the U.S.Senate. It has the force of law only when it is endorsed by the president, there are enough votes to override a presidential veto, or there are enough votes for ratification in both houses.
Justipedia explains Joint Resolution
Although there are no hard-and-fast rules for doing so, there are many circumstances in which Congress will propose and pass joint resolutions, rather than traditional legislation, or bills.
For example, it will do so in order to change the Constitution, or to allow for new or additional spending. It will also do so to establish holidays or other special days of recognition. When necessary, the House and Senate will approve these measures to justify American military action.