An-asgaidh (free of charge)

One of the unusual concepts to get used to with regards to computing is the concept of free and open-source.

This has plus points as well as negatives.

It is very unusual for someone to give things for free. The nature of coding is that any one can do it. Not everyone is interested in money. A good example of this is Wikipedia. Which is a free, not for profit, encyclopedia founded by Jimmy Wales. 

Free software or Freeware is software developed by an individual. Then the individual releases it to the world for free. There are many reasons someone might give something for free. It might be a proof of concept to see if people are interested in such software. It may be to show an example of the individuals work in order to secure employment. There are many reasons.

Lichess.org is a good example in the chess world.

Open-source is code that is made freely available to the world. This is different to having the program freely available. The intention with open-source is to enable others to possibly improve on the code. As long as the individual acknowledges the source code and individual who created the source.

These are concepts prevalent in computing and for experienced developers are quite easy concepts.

The good side is that anyone can learn to code, and produce good bug free code. The downside is that anyone can learn to code, and can produce buggy and hackable code.