Bob Kahn is a smart person who helped create something called the Internet. The Internet is like a big library, but with information from all over the world and you can access it from your computer or phone.
Before the Internet existed, it was hard to share information between computers that were far apart. Bob Kahn and some other smart people worked together to create a way for computers to talk to each other and share information. They made special rules (called protocols) that let different types of computers understand each other and communicate.
Bob Kahn and his friends also created something called TCP/IP, which is a set of protocols that allows computers to exchange information with each other across different networks. This helped create the foundation for the Internet we use today.
So, basically, Bob Kahn is a very smart person who helped create the protocols and technologies that let us use the Internet to find information, communicate with others, and much more.