Amazing visual explanation: pass by reference Vs pass by value

Think of the coffee in the cup as the #data in a variable. One is a copy and the other one is the original.

gif credit: penjee

https://media.licdn.com/dms/image/C4D22AQHrjx3qDNn_Cg/feedshare-shrink_800/0/1672665015273?e=1676505600&v=beta&t=PyVnoRhAbmSgbhX2YDSwDx3N_dh5icvwSsVQz25iyCE