An internet routing registry is like a big set of instructions that computers use to send data to the right place. When you go to a website, your computer has to find where that website is stored so you can get the information you want. An internet routing registry lets it do that by giving the computer a list of places it can look. It helps computers know the best way to get the data they need to your computer so you can see the website or use whatever online service you're trying to use.