Speed and velocity

1. Speed is often confused with velocity and is thought to have the same meaning.  
2. Speed and velocity are two different things. 
3. Speed is a measurement quantity, which means that there is no direction attached to its definition 
4. and only represents the extent of its velocity. 
5. Velocity .... represents both the speed of an object and its direction. 
6. For example if a car travels north at 40 miles per hour, then its speed is 40 miles per hour and its velocity is 40 miles per hour to the north.       
7. edited source