Dozens of influencers on YouTube (if it still exists when you read this) will explain artificial intelligence (AI) better than I can. I don't understand how AI works. What I do know is that currently (June 2026) it is very useful. Particularly for programming. I use DeepSeek almost exclusively because it is one of the existing AIs that is open source. Remember that open source does not mean free software (in Richard Stallman's definition). The difference is important. DeepSeek and other "opensource" have MIT, Apache, or BSD licenses, which are fine, but they are not GNU GPL. I always hesitate between BSD and GPL but I always write GPL.
Currently DeepSeek helps me a lot as a reference manual for any language, for code translation, and for generating new code. It has some volume limitations; for example, according to the tests I have carried out, it cannot handle all the Fortran code of leparagliding (it says it is "massive" due to its high number of lines). I think it cannot because it does not want to. Because when it comes to writing small HTML programs (and applying quite a bit of science), it does them in no time, and better than I would do them... The problem of checking and debugging remains, but the leap for programmers is spectacular.
To be continued...