Scalar product refers to the undirected product of the multiplied value relative to the vector product. Two different multiplications between vectors can get the inner product (scalar product) and the outer product (vector product).
The inner product is a general vector multiplication, and the product of their lengths is multiplied by the cosine of the included angle.
The value of the outer product is that two vectors determine the areas on both sides of the parallelogram, and the perpendicularity of the two vectors is determined by the right-hand rule.