La cédille
Undoubtedly the cutest of the French accents, this little squiggle looks a lot like a number 5 without its lid and descends from the middle of the bottom of the letter 'c'. So what does it do? It changes a hard 'c' sound to a soft one.
French works very similarly to English when the letter 'c' is followed by a vowel.
The cedilla (or c cédille in French) changes a hard 'c' to a soft one. Even our most débutant* students will have seen this at work in 'ça va', which, if not for the accent, would sound like 'ka va'.
*beginner