Okay, imagine you have a secret room that only you can go into. But instead of a room, it's a website where you can go to see all the things you need to know about your account with a company.
This website is called a client portal. Think of it like a special door that only you have the key to. Through this door, you can see information like how much money you have in your bank account or how many points you have on your loyalty card.
You can also use the client portal to communicate with the company. You can send them messages if you have questions or problems, and they can send you messages to let you know about any updates or changes to your account.
Basically, the client portal is like your own special room where you can see everything you need to know about your account with a company, and talk to them if you need to.