Difference between Perspective, Isometric, Oblique and Orthographic drawing

http://t1.gstatic.com/images?q=tbn:kvn9w5eKR1u-6M%3Ahttp://www.wooddigest.com/images/article/1190670408506_education2.jpg
Perspective drawing is 3D and is from different angles.

http://t3.gstatic.com/images?q=tbn:KT-b3vlger8wPM%3Ahttp://www.bbc.co.uk/schools/gcsebitesize/design/images/dt_g_dmi_tp6.gif
Isometric drawing is easy to draw because it uses regular scale. It shows the drawing from an angle.
Oblique drawing shows it face on and is similar to isometric since it uses a regular scale. it is a way of showing depth.
http://t1.gstatic.com/images?q=tbn:yc41pw5gdVeGXM%3Ahttp://mathforum.org/workshops/sum98/participants/sanders/oblexamples.gif


http://www.hollyzell.com/images/art121/orthographic.jpg
Orthographic view shows 1 side. Orthographic drawing are views of an object.