Question

Define scalars?? explain about them

Answer 1

Scalars are the quantities having only magnitude not direction or the quantities which does not depend on direction.

They are physical quantity that only have magnitude and no other characteristics.

Time, temperature, speed and mass, etc. are scalar quantity.

The quantities having direction as well as magnitude are called vectors.

Answer 2

scalars
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scalar quantities are the quantities which have only magnitude and no direction 

examples of these quantities are :- distance , volume , time etc
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the product or addition or any operation of the scalar quantities will give a scalar quantity 

for example :- speed = distance /time

speed is a scalar quantity

but if any operation is done between the scalar and a vector will give a vector quantity 

for example :- velocity = displacement/time

displacement and velocity are vector quantity 
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vector quantities have both magnitude and direction 
example :- acceleration , velocity etc