Mobile interaction means using a device like a phone or tablet to access the internet and do important things. For example, if you want to buy something online, you can use your mobile phone. You type in the website address, login to your account, and then choose what you want to buy. After that, you will make the payment, and the website will send you a confirmation that your purchase was successful. It's so convenient to do things on your mobile phone and make them happen quickly!