Green and red arrows on messages..

[Sjoui01]

Samsung galaxy s7 edge... i was wondering if anyone knows what the little green and red arrows mean in the messaging area.. some have a lil green arrow on them and some have a red arrow.. does this mean that the green arrows next to that particular person that the message has been recieved and read and the red arrow means it has been recieved but not read..or red meaning they did not recieve the message???

 

[Sean Fanelli]

Green down arrow means it was a message sent to you, red arrow going up means you sent a message