What is the difference between a Diagonal line and an oblique line?

A diagonal line is a straight line that connects two non-adjacent corners of a shape, typically forming a 45-degree angle with the sides of the shape. An oblique line, on the other hand, is any line that is neither horizontal nor vertical, and can be at any angle other than 90 degrees. In essence, all diagonal lines are oblique, but not all oblique lines are diagonal.