A vector is a quantity that has both magnitude and direction. Examples of vectors include velocity, acceleration, force, and momentum. The magnitude of a vector is the amount of that quantity, while the direction is the angle at which it is acting.

Vectors are often represented by arrows, with the length of the arrow representing the magnitude of the vector and the direction of the arrow representing the direction of the vector.

Vectors can be added together and subtracted from each other, and the result of these operations is another vector. Vector addition and subtraction follow the same rules as scalar addition and subtraction, except that the direction of the resultant vector must also be taken into account.

Vectors are important in many areas of physics, including mechanics, electromagnetism, and thermodynamics.