It is often used in a casual and friendly way, like a way of saying goodbye or expressing affection.
Here are some ways "bisous" is used:
* "Bisous à tous!" (Kisses to everyone!)
* "Bisous, mon amour!" (Kisses, my love!)
* "Je t'embrasse, bisous!" (I kiss you, kisses!)
It's important to remember that "bisous" is a more informal way of saying "kisses" than "baisers" which is more formal.