Scalar:

• A scalar is a single numerical value, such as an integer or a real number. It has magnitude but no direction.
• Scalars are used to represent quantities that have only magnitude, such as temperature, time, distance, or mass.
• Scalars are typically denoted using regular letters or symbols (e.g., "x," "t," "m").

Vector:

• A vector is a mathematical object that has both magnitude and direction. It is represented by an ordered list of scalar components.
• Vectors are used to represent quantities that have both magnitude and direction, such as velocity, force, displacement, or acceleration.
• Vectors are typically denoted using bold letters (e.g., "v," "F," "d") or with an arrow symbol above the letter (e.g., "→v," "→F," "→d").