The North Atlantic Treaty Organisation (NATO) was founded in 1949, primarily as a military alliance to counter the potential Soviet threat to Western Europe.
The situation has clearly changed a great deal since the end of the Cold War but the Alliance remains vital to our security.
Representatives of 47 nations and organistions involved in counter-piracy operations met at NATO Headquarters to address a shared challenge.
NATO’s core purpose is still to guarantee the freedom and security of its members through political and military means
NATO has operations in a number of different territories. Find out more.
Find out more about the UK's relationship with NATO
This famous article means an attack against one member is considered an attack against all