It depends. If you are referring to animations on the computer, there are a wide variety of animation programs. Flash, Pivot, etc.
animations
In Photoshop U can make only .gif animations.
The only special requirement needed to make computer animations suitable for films is a stop motion type computer program. You can make these using 2D or 3D computer graphics.
A computer graphics specialist uses planning and storyboards to create projects. They use computer graphics to make animations, tables, charts, and other designs depending on the company they work for.
In order to produce quality animations you will need software to do this. Adobe Premiere Pro Final Cut Pro (Mac) Corel Video - great for beginners ULead Video Studio Pinnacle Studio
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Computer animations can be found where graphic designers and 3D artists work. It is very common nowadays to use computer software to produce animations because it is both easier and less time consuming. You can find many examples on different websites such as NetAnimations. Also remember that most modern movies, in particular so called animated movies are brilliant examples of computer animation.
Flash Developers basically work on computers. They do all the cool animations, and Flash animations that you see on different websites, computer or cell phone apps and computer and console games.
Sure.
If you save a picture from the internet into your pictures folder or desktop, then you can right click the icon of the picture that you want and select 'set as wallpaper'.
The advanced features of a presentation software are the animations. These animations are the one that make it unique.