Imagine a big, boxy machine from the 1980s, like a super-smart calculator for grown-ups! That was the ICL System 25. It helped stores keep track of their toys and offices count their money. It had lots of blinking lights and buttons, and used keyboards to type on screens showing letters and numbers. It's like a grandparent of today's computers, showing how they used to be big and help businesses before laptops and tablets were invented.
