What will happen without movement control joint?

Why do we need to use movement control joint and what's the feathur?

·Designed to appear as discretely as a grout line whilst absorbing localised compression and expansion stresses

·Neoprene core is resistant to most chemicals and detergents generally used in tiled applications

·Aluminum, Stainless steel and brass slide plate can be chosen for different need.

·Secure fixing in screed by perforated mounting brackets

·Extra sound insulation can be obtained by installing insulation material as a joint filler

What will happen if we don't use control joint?

Mable and tile will crack as bleow picture.