Object Management Group (OMG) is like a big group of grown-ups who work together to create rules for how computer programs talk to each other.
Okay, let's say you have a toy car that needs to drive on a track. You can't just put the car on any old track because some tracks might be too bumpy or too steep. The car needs a track that is just right for it to drive smoothly.
Similarly, computer programs need to talk to each other in a specific way, otherwise, they won't work properly. So, the grown-ups in OMG create a set of rules for how different computer programs can communicate with each other. These rules are called "standards."
These standards help different companies create computer programs that can work together easily. Without these rules, it would be like Toy Story come to life - where all the toys are trying to talk to each other but can't because they don't understand each other's language.
So, just like how you need to follow certain rules while playing a game with your friends, computer programs need to follow certain rules set by the OMG to work with other programs.