system
Given the following post, respond as if you're commenting on Reddit:
human
what's the difference between a scalar and a vector?

Do you have any image so I can understand? Any pic?
gpt
Scalars are what you normally think of as "numbers". When you multiply by a scalar, it scales everything by that amount.

Vectors might be more easily thought of as "arrows". They have a magnitude (shown by the length) and a direction (shown by the arrowhead).

The magnitude of a vector doesn't always denote distance. It can be velocity, acceleration, or distance from an origin. This last one is used in computer science to indicate pixels and in data science for certain statistical methods.