How do I find the model number on the Apple MacBook?

MacBook’s can be identified by its serial number.

The serial number can be found on the bottom case.

Or

Turn on the MacBook and click the Apple logo ( Top left side of the screen )

MacBook Pro "Core i5" 2.6 13" Mid-20142.6 GHz Core i5 (I5-4278U)

Intro.	July 29, 2014	Disc.	March 9, 2015
Order	MGX72LL/A*	Model	A1502 (EMC 2875)
Family	Retina Mid-2014 13"	ID	MacBookPro11,1
RAM	8 GB*	VRAM	1.5 GB*
Storage	128, 256 GB SSD	Optical	None*
Complete MacBook Pro "Core i5" 2.6 13" Mid-2014 Specs

MacBook Pro "Core i5" 2.8 13" Mid-20142.8 GHz Core i5 (I5-4308U)

Intro.	July 29, 2014	Disc.	March 9, 2015
Order	MGX92LL/A	Model	A1502 (EMC 2875)
Family	Retina Mid-2014 13"	ID	MacBookPro11,1
RAM	8 GB*	VRAM	1.5 GB*
Storage	512 GB SSD	Optical	None*
Complete MacBook Pro "Core i5" 2.8 13" Mid-2014 Specs