I magine a pizza restaurant where there is only one chef who can prepare one pizza at a time. The customers come in one by one and place their orders, and the chef has to make each pizza from scratch, one after the other. This is similar to a processor with a single instruction unit.
Now imagine a pizza restaurant where there are four chefs, each with their own workstation, and they can each prepare a different type of pizza simultaneously. When the customers place their orders, the restaurant can assign each order to the appropriate chef based on the type of pizza they want. This allows the restaurant to prepare multiple pizzas at the same time, significantly increasing the throughput of the kitchen. This is similar to a processor with a four-wide superscalar architecture.
In this analogy, the chefs represent the functional units in the processor, and the different types of pizza represent the different types of instructions that can be executed in parallel. By having multiple functional units that can process different types of instructions at the same time, a wide superscalar architecture can increase the throughput of the processor and improve overall performance.