Why is my chats coming up green?

[AC Question]

So I have an new Samusng Galaxy s6 and all my other texts are coming up yellow and blue....well tonight I texted my cousin and it came up green and blue....it also says chat message instead of send message.....what does this mean??? driving me nuts!!!!

 

[B. Diddy]

Welcome to Android Central! Are you using the stock Messaging app, or a 3rd party one?

 

[lucianus_luciferus]

ahh

 

[B. Diddy]

ahh

... CHOO!!!