What is it?
Ram or Random-access memory, temporarily holds data that needs to be accessed quickly. When you open a program, it is opened from the SSD or HDD and stored in the ram while you are using it. If you do not save it back to the SSD or HDD before shutting down, that data will be lost.
Popular brands and their prices
Other things to consider
The most two common types of ram are DDR4 and DDR5. DDR5 offers significant speed upgrades.
Speed is a huge factor in what ram you choose. You also want to have enough ram capacity to support your
computer.
8 GB is usually sufficient for browsing the web and doing basic office work. For gaming and running multiple
applications 16 GB or more is recommended.