In a diagram, a vector is typically represented by an arrow. The direction of the arrow indicates the direction of the vector, and the length of the arrow is proportional to the vector's magnitude.

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Here are 5 related questions to expand on this concept:

1. What are the key differences between a vector and a scalar?
2. How do you calculate the magnitude of a vector?
3. What are unit vectors, and how are they represented?
4. How can vectors be added graphically in a diagram?
5. What are the real-world applications of vectors in physics or engineering?

Tip: Always remember that vectors not only have a magnitude but also a direction, which makes them different from scalars, which only have magnitude.