A scalar is something that only has a size or amount. Examples of this are mass and speed. A person may have a mass of 70 kg, or a car can be travelling at 53 mph. These measurements have a size (magnitude), but there is no direction.
A vector is something that has both a size and a direction. An everyday example of this is the weather forecast that will describe the wind as blowing at 10 mph from the South.
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