Question

What is the difference between AB and BA.
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Answer 1

They are technically the same thing

Explanation:

Line BA is the same as line AB. Both pass through the same two points A and B. A line-segment may be also a part of ray. In the figure below, a line segment AB has two end points A and B

Answer 2

the difference between
`\vec{AB}\: and \: \vec{BA}` is:

`\vec{AB}` is equal to opposite of
`\vec{BA}`

mathematically:

`\vec{AB}=-\vec{BA}`