In 2015, Apple released several MacBook products, including the MacBook Air and MacBook Pro.
The MacBook Air was available in 11-inch and 13-inch models and was powered by 5th-generation Intel Core i5 or i7 processors, with options for up to 8GB or 16GB of RAM. The MacBook Air featured a slim design, long battery life, and a solid-state drive (SSD) for fast storage.
The MacBook Pro was available in 13-inch and 15-inch models and was powered by 5th-generation Intel Core i5 or i7 processors, with options for up to 16GB of RAM. The MacBook Pro featured a more powerful processor, dedicated graphics card, and a Retina display. The MacBook Pro was also available with an optional Touch Bar, which added touch-based controls to the keyboard.
In 2015, Apple also introduced the 12-inch MacBook, which was a completely new design with a Retina display and a new, ultra-thin form factor. The 12-inch MacBook was powered by a 1.1GHz dual-core Intel Core M processor and was available with options for up to 8GB of RAM.
In conclusion, the MacBook lineup in 2015 offered a range of options for users with different needs, from the ultra-portable 12-inch MacBook to the powerful 15-inch MacBook Pro.