Really! I assumed it to simply be, once again, the difference between proper British English and our Americanized version... you know... the old honor/honour neoteric...
Practice is a noun
Practise is a verb - simple really.
The problem with this example is that both sound the same. I always tell people to use advise and advice as a measure of whether it should be "c" or "s". You would never give someone good advise would you?
Very little difference Scarlett - except that practice is usally used for places of medication, such as a doctor's or dentist's practice, but it's also used to mean performing a repetitional feat, or one of memory.
Practise in the other sense is often used as a verb - or to do something.
Both can actually be applied to that though.
practice is an object ie a noun and practise is a doing word ie a verb.
noun eg i need lots of practice
verb eg i must practise alot
hope this has simplified things for you Scarlett.