Anonymous wrote:I usually mix up in these..

Can someone plz help ?
Any link?

Use semi colon when you think the sentence is complete; still you dont want to put full stop just yet

...usually used to separate complex/coplicated sentence

let me give an example so it'll be easier to understand how these words work 8)

"Whenever I log in to the forums and see new topics, I usually end up doing one of following things: I read whole topic and post my opinion; or I just read title of the topic and ignore it completely."

haha this must have complicated the things.
let me know if you want further explanation.

colon and semicolon sometimes used in 'event n reasoning' sentences.
e.g.
"Sometimes I really dont recollect to whom I replied to on forums; forums population has increased tremendously."

note that you can also use colon on above example.