What are the characteristic of linear prespective?

In a linear perspective picture, all lines that create Depth will go towards ONE perspective point. Example: http://www.ider.herts.ac.uk/school/courseware/graphics/images/1point_kitchen.gif

This is also known as one-point perspective.

This kind of perspective is generally used when you are facing directly at an object

A 2-point perspective is exactly the same, only instead of 1 set of lines for depth going towards the 1 perspective point, there are two. Example(s): http://www.utdallas.edu/~mel024000/pages/ill_space.html

This kind of perspective is generally used when you want to get the angle/corner of an object

A 3-Point perspective is, again similar to the other two, only now you're including a

3rd point which is used to direct the vertical lines to give a sense of height. Example: http://www.andrewdiec.com/Perspective/3Point.jpg

This kind of perspective is generally used when displaying large buildings to give a sense of great height.