Smartphone RAM: What is it, and when do you need more?

[Windows Central]

Your phone needs RAM to operate, but why? And how much?
It looks like Vivo is going to be selling a phone with 10GB of RAM. That's almost as much as many gaming PCs and about 6GB more than most phones. It has a lot of folks scratching their heads and asking why in the world does it need 10GB of RAM, and does that mean my phone with 4GB needs more?

Full story from the WindowsCentral blog...