Arial was born out of corporate necessity. In the early days of computing, IBM needed a sans-serif font for their laser printers. They couldn't afford the licensing fees for the wildly popular Helvetica. So, they commissioned Monotype to create a font that would fit in the same metric spacing as Helvetica but was distinct enough to avoid lawsuits.
It is (proprietary, Monotype). You get it via: arial normal panose default font best download
: Because Arial is nearly ubiquitous on Windows and macOS, it is often the "Default" choice for modern, sans-serif font substitution. How to Get Arial Normal (Regular) Arial was born out of corporate necessity