3d design - Ram purpose in 3d projects, does Ram size affects rendering speed?

What it is the purpose of RAM in 3d design projects? Why do I need a lot of RAM in 3d Design projects? and Does Ram affects rendering speed? RAM: Random access memory does GPU Affects Rendering speed https://youtu.be/xtROrdvDbMs Arabic Version: https://youtu.be/KTLZ8pDucBE?list=PLvyTazcWChK9wxHvu6KXpfCXlZSchlr-W https://www.paypal.com/donate/?hosted_button_id=CC4JCVRCGUXNU https://www.amazon.com/shop/-arresha Instagram https://www.instagram.com/tawfiq.as/ twitter https://twitter.com/arreshaStudios facebook page https://www.facebook.com/ArreshaStudios/ by: Tawfiq Abu Halawah http://arresha.com #arreshaStudiosENG #استوديوهات_الريشة توفيق أبو حلاوة