Why datum point and baseline are most suitable for sketch?

A datum point and baseline are essential in sketches because they provide a reference framework that ensures accuracy and consistency in measurements and proportions. The datum point serves as a fixed reference, while the baseline establishes a horizontal or vertical guide, allowing for precise alignment of elements in the sketch. Together, they facilitate clear communication of design intent and help in maintaining spatial relationships among various components. This structured approach enhances the overall clarity and effectiveness of the sketch.