No offense to anyone intended . . . I think some clarification is in order.
A scalar has magnitude but not direction. An example of this is a temperature (say 212 degrees F).
If something is 212 degrees F, there should be no misunderstanding of what this means, with no
further description. You don't need to specify the direction of temperature, as temperature itself has no
direction.
Speed is also a scalar. For example, "I am going 100 miles per hour." This can give an idea of related
scalar things like "I'm exceeding the 65 mph speed limit by 35 mph. There is a lot of momentum
represented in my motion right now. Also kinetic energy. I don't want to hit a fire hydrant."
Velocity is a vector and has magnitude and direction. An example of this is described by saying "I am
going 100 miles per hour southward. In many cases, the direction is quite important. When you are
navigating, you should be aware of direction as well as speed.
Mass is a scalar. An example of this is illustrated by a bowling ball having a mass of 16 pounds. On earth,
the bowling ball would typically weigh 16 pounds of force (a vector having magnitude and downward direction).
But on the moon, the same bowling ball would have a weight of only about 3 pounds (of force). It is important
to indicate whether one is talking about force or mass, which are not interchangeable.
A common unit of force is "pound of force", or lbf, while a common unit of mass is "pound of mass", or lbm.
It may be convenient to remember that a one-lbm item (such as a small bag of dried beans) weighs one lbf on earth.