An oracle machine is like a magical genie that can answer any question you ask it. But it's not just any genie - it's a special genie that can only answer questions about certain things (like math problems or logic puzzles). Think of it like a very smart person who knows a lot about a specific subject.
To use the oracle machine, you have to tell it what question you want to ask. Then, the machine uses its special knowledge to come up with an answer. It's kind of like a calculator or a search engine, but much more advanced.
The reason oracle machines are important is because they help us solve problems that might be really hard or impossible for us to solve on our own. So scientists and mathematicians use them to do research and make discoveries. Oracle machines are also used in computer science and artificial intelligence, to help computers "think" more like humans.
In summary, an oracle machine is a super smart genie that can answer almost any question you ask it, as long as it's about something specific. It's very helpful for solving difficult problems and advancing our knowledge in many different fields.