What are the benefits of using Blocks & WBlocks in drafting with AutoCAD?

if you are change the one block. Change All Block one time.

The basic use of block is as reusable contents. You can define a block once, then use it repeatedly without redraw it in new drawings or in the same drawing. You can choose to copy the objects. But when the drawing gets complicated, this can be a difficult task. If you draw it more than once, you may want to consider create a block from it.

The main use of block is again and agian we are in need of same things.for ex.,I AM CRETE A WINDOW.I NEED THE WINDOW FOR MANY TIMES.IF I CREATE WINDOW ONE TIME USING BLOCK I CAN USE THE SAME BLOCK FOR INFINITE NO OF TIME.SO WE CAN QUICKLY FINISH THE TASK..

The Main benefits is drawings finishing very fastly. main advantage is less the working time& quickly show in your results