Okay, imagine that you have a bunch of different blocks with different shapes and sizes. Some are square, some are rectangular, some are tall, and some are short. Now imagine you want to do some math with these blocks, like adding them together or multiplying them. But since they all have different sizes and shapes, it's hard to do the math with them.
That's where a generic matrix ring comes in. Now imagine that you have a special kind of block that can hold all the other blocks in a grid pattern. This special block is called a matrix. Each space in the matrix can hold a different block, and all the blocks can fit into the matrix grid.
Now when you want to do math with the blocks, you just put them into the matrix and do the math with the whole matrix as one big block. This makes it much easier to add and multiply the blocks, even if they are different shapes and sizes.
A generic matrix ring is kind of like having a whole bunch of these matrix blocks, and being able to do math with all of them together. It's a special type of mathematical structure where you can add and multiply matrices just like you would with regular numbers, but the numbers inside the matrix are actually blocks of different shapes and sizes.