Okay, kiddo, let me explain 2G in simple words!
2G means the second generation of wireless mobile technology. Just like your toy phone, phones also need to talk to each other. 2G helped phones talk to each other wirelessly with voice calls, text messages (SMS) and picture messages (MMS).
2G worked through radio frequencies that were transmitted in the air from one phone to another. It made communication faster and more efficient than the older technology. In the older 1G technology, people had to use analog signals which were slower and less reliable.
2G was introduced in the 1990s and was a big deal at the time. It allowed mobile networks to grow and make phone calls more accessible for people on the go. It was also the start of mobile internet access which led to the evolution of smartphones and the even faster 3G and 4G technologies.
So that's 2G in a nutshell, buddy. Hopefully, that answers your questions!