Scalar Quantity:

* A quantity that has only magnitude (size or amount) but no direction.

* Examples: mass, temperature, time, distance, speed, energy, work, power.

Vector Quantity:

* A quantity that has both magnitude and direction.

* Examples: displacement, velocity, acceleration, force, momentum, electric field, magnetic field.

Key Difference:

* Scalars can be added, subtracted, multiplied, and divided using simple arithmetic operations.

* Vectors require special mathematical operations like vector addition, vector subtraction, dot product, and cross product to account for their direction.