An electronic filter is like a strainer for electronic signals. Just like how a strainer separates the solid food from the liquid in cooking, an electronic filter separates the useful electronic signals from the unwanted ones.
So, when a device sends out electronic signals, like a radio, there are other signals that can interfere and make it hard to hear what's being transmitted. An electronic filter helps to block out those unwanted signals and lets you hear the important information.
Imagine having a bunch of toys of different sizes and shapes in a bucket. Some are the ones you want to play with while there are ones you don't want. You can pour out only the toys you want to play with using a special tool, that is filter. Similarly, an electronic filter picks out the signals that you want to work with and removes the unwanted ones.
Sometimes these filters are combinations of different parts, like a bunch of strainers all fitting perfectly together. They can be made up of things like resistors, capacitors, and inductors, which are like different sizes and shaped strainers, each designed to let certain electronic signals pass through while keeping the others out.
So, an electronic filter is like a good friend who helps you listen or work with only the signals that you want by blocking out the unwanted signals in a smart, strainer-like way.