Velocity is speed in a given direction. When you drive in a car, you read your speedometer to find out the car's speed.
Speed is recorded in miles or kilometers per hour.
In order to know the car's velocity, you must know the car's speed and you must also know what direction the car is traveling. So if you know your car is traveling north from Salt Lake City to Logan and your speedometer reads 75 miles per hour, then you also know your car's velocity. On the weather channel a hurricane's path is explained in terms of velocity. People want to know how fast a hurricane is traveling but they also need to know in what direction it is traveling so they can evacuate if necessary. For instance, the weatherman will report a hurricane's velocity as five kilometers per hour moving in a northeasterly direction.