To open and read this format made up of vector images, bitmaps and text, there are loads of possibilities, but none of them are better than Adobe Acrobat Reader DC, a program that ever since it was released has received regular updates, such as version 11 or this 2018, the latest edition to the date. The first version was born in 1993 and became an open standard in 2008 with an ISO standard that establishes the requirements to be considered as such. Portable Document Format is the only solution to document portability. In other words, it allowed us to read a document without suffering alterations, regardless of doing so on Windows, Mac or Linux, and now Android or iOS.
The PDF format was initially developed by Adobe Systems in order to bring portability to documents between different systems.