In mid 2000s, you usually must download the whole package first, then you can install it. But now, installer like chrome, steam, can download and install at the same time. How does it work?
In: Technology
This may have to do with increasing complexity of modern CPUs. Older machines may have only a single core CPU, while modern machines may have up to 64 cores per CPU. A single core CPU can only do 1 thing at a time, such as download a program or install said program. Multi-core CPUs can do both at the same time.
A useful analogy to consider is that of a builder constructing a wall. The builder needs to get bricks from the store (downloading), and then build the wall (install). Having a single worker (CPU core) means that they can only go to the store to get bricks or build the wall at any one time. Having more than 1 means that one worker can go to the store while the second builds the wall.
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