The PSP has an extremely limited amount of space, which is reserved for things like system settings and updates. To put music or games on, and even to save game data, you need a memory stick.
we wouldn't have portable things like sell phones
No, the PlayStation 1 & 2 memory cards will not stop working.
You need a memory stick inside a PSP to be able to download things.
When you are browsing the internet, pictures can be downloaded to memory stick from the page options. Also, if your firmware is updated fully, you can download things from the Playstation Network.
PSP UMD movies are about a lot of different things. Basically it is movies and television shows released in the United States on the Universal Media Disc (UMD) for the Playstation Portable (PSP).
There are no such things as PlayStation Points. There are Xbox Live Points which you have to buy in order to purchase things from the store. The PlayStation Store just uses cash.
the vmu was used as a memory card, a screen for your controller so you could see things that other people could not see in the game, and a portable game player.
No, you purchase games, movies, etc. with the PlayStation Credits.
A computer can still operate without virtual memory (virtual memory is just hard drive space that is set aside to allow the computer to swap data to and from actual RAM). It is just that on a modern multitasking system things could slow down if you have a lot of things going on and the system is reaching its memory limit. With virtual memory turned off a system with minimal memory will tend to really slow down a lot. It may not be as bad on a system with lots of memory (like 2GB or more).
The PlayStation Homepage is referred to as a Cross Media Bar or XMB for short. It has an icon for all of the things you can do on your PlayStation from Music to gaming.
Memory of skills and How to do things.
NGP can stand for various things depending on the context. The most common meanings are "New Game Plus" in the context of video games, or "Next-Generation Portable" in the context of gaming consoles, specifically referring to the PlayStation Vita's codename.