What is the difference between "illusion" and "delusion"? Examples in sentences are appreciated.
That's not quite how this forum works. First, you tell us what definitions you have found for those words in a few dictionaries. Then you tell us what difference you think there might be. Then you give us some sentences using both words so that we can see how close you are to understanding their usage.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.