What is the difference between Glyph and Font?

I was going through one document and I came across this term 'glyph'. The term was new to me so looked into wiki for its definition. I felt both glyph and font is same. Am I correct? Else please tell me what is the difference between this two.

Edit:

I am newbie in this field. So feeling bit difficulty to picturise your answers. If you can add examples in your answers that will be very much helpful.