. Apple is a very reputed company in the computer field from years. RAM is used for Random Access Memory.You need to check the kind of memory before you purchase it and the easiest way to figure this out is to look in the manual that comes with the Mac computer. You will see a section on memory upgrades which advises you exactly what type and speed of memory is needed for your Mac.
Lets talk about the pricing of Mac RAM. Prices for Apples Mac RAM and hard drives are outrageously high and the company loves profit. So whenever you can buy your Mac with the stock RAM and upgrade later with third party RAM from a Supplier who is reputed. The company Apple buys Samsung, Hynix and Micron RAM modules in bulk just like third parties do. So there is nothing special about the branded memory of Apple.
But when you are buying memory it is generally not advisable to go with the absolute cheapest stuff in the market. Mac RAM models have a reputation for being very picky about the quality of RAM. IF you buy low quality memory then it often will cause application crashes, total machine crashes, and data corruption in your computer. So it is necessary to do your homework on quality reputation up front, and be advised that while buying generic memory saves you money. If you use High Density RAM in your Mac then you may also have issues.