What is the history of The Open?

The Open Championship holds the distinction of being the oldest golf tournament in the entire world, having been first played way back in 1860 at Prestwick Golf Club in Scotland.

Because there were absolutely no other national open tournaments existing anywhere else on the globe at that specific time, organisers had no reason or need to use a geographic identifier to differentiate their new event.

What does the word 'Open' mean in this context?

The specific term 'Open' was adopted to explicitly indicate that the tournament was completely open to all skilled players, welcoming both professional golfers and top-tier amateurs to compete against one another on the same course.