iMacros is a tool that helps you do the same thing over and over again on your computer. It's like a robot that you can program to do things for you. Imagine you have a big pile of lego blocks and you want to build the same structure every time. You can tell the robot (iMacros) which blocks to use and where to put them so that it builds the structure for you.
For example, let's say that you need to log in to a certain website every day. With iMacros, you can record the steps you take to log in (typing your username and password, clicking the login button, etc.) and save them as a "macro." Then, every time you need to log in, you can just open iMacros, select the macro you made, and let the robot do the work for you.
iMacros can also help you with other things like filling out forms, downloading files, and even making decisions based on certain conditions. It's like having a little helper that can save you a lot of time and effort!