Embossing produces impressed effect which is a raised image on a page using special types of dies and heat.
Debossing does the same in reverse and produces a depressed effect which is the image is sunk in to the page.
These effects can be used alone or combined with other embellishments for more of an impact.
Consider using spot UV coating or foil with embossing or debossing to draw more attention to the textured image or logo.