What is the use of grid in autocad drawings?is it necessary to fix the grid in drawings?

Beside the above. I think grid is just a guide for you to know if you reached the required limit or not by a glance look. but it will not be effective if you do not use the "snap to grid" option which will gurantee to you that you have reached to the point you want. specially if you dont have a reference object.

some time its necessry to fix grid other wise if you do not fix it does not matter

Grid is an important part of drawing window. While we make lengthest object.

For the necessity of picking exact pionts for the each entity in drawing window.

And it make right deviation to points in the object..

Thanks

As per Autodesk:-

To enhance drawing speed and efficiency, you can display and snap to a rectangular grid. You can also control its spacing, angle, and alignment.

The grid is a rectangular pattern of lines or dots that covers the entire XY plane of the user coordinate system (UCS). Using the grid is similar to placing a sheet of grid paper under a drawing. The grid helps you align objects and visualize the distances between them. The grid is not plotted.

Grid Snap restricts the movement of the crosshairs to intervals that you define. When Snap is turned on, the cursor seems to adhere, or "snap," to an invisible rectangular grid when you create or modify objects.

Grid and Snap are independent settings but are often turned on at the same time.

Thank you

I agree with the previous answers

Thanks for the invite I am waiting for answers to relevant experts