I/O is something that literally every program has to do. Its also the bottleneck of 99% of code running on modern hardware. Moving bytes from one place to anoth

I/O is something that literally every program has to do. Its also the bottleneck of 99% of code running on modern hardware. Moving bytes from one place to another is essential and relatively slow. Understanding how to deal with memory I/O and file I/O performantly is a relevant skill for every program and programmer.