Define parallel vectors.

When the cross-product of two vectors is zero, they are known as parallel vectors. 
For example, the zero vector is parallel to all other vectors. 
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Is it necessary for two parallel vectors to have equal magnitude?


No, two parallel vectors need not have equal magnitude.
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When two or more vectors are said to be coplanar vectors?

When three or more vectors lie on the same plane, they are known as coplanar vectors.
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Define unit vector.

The vector whose magnitude is unity is called unit vector. 
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Define collinear vectors.

Two or more vectors lying along the same line or parallel lines are known as collinear vectors. 
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