just a confusion

[TimeKeyRoll]

addrssToAmount[msg.sender]+= msg.value;

I understand line of code which is mentioned above but what i don't understand is `+` sign. Not sure how its helping the function. could anyone help me to understand this in easy language please?

[technophile-04]

Hii @MasterofBlockchain , Its and another way to say
addrssToAmount[msg.sender] = addrssToAmount[msg.sender] + msg.value;
We are just addingmsg.value to addrssToAmount[msg.sender] and updating it

[TimeKeyRoll]

Wonderful explanation. Thankyou