Artificial Intelligence (AI) is a branch of Computer Sciences. Simply, any computer algorithm or system simulates a human activity, called an artificial intelligence.

There are hundreds of examples, such as:

1- The computers currently have the ability to recognize the human faces, we called this process (face recognition).

2- Google Translator ( Translation process)

3- Auto-Driving Cars ...

4- Natural Language Process (NLP) which consists of tens of topics, such as text summarization, text mining, and text classification.

5- Games, the computers currently have the ability to play board games ( e.g. chess) against the humans, and beat them.

6- BioMedical Topics, BioInformatics Topics, and AstroInformatics Topics.

7- So on, ....

All of the above mentioned examples, are human activities, the researchers have created computer algorithms for simulating them, with fast and more accurate results.

Hope this helps,

Regards..

https://en.wikipedia.org/wiki/Artificial_intelligence

This notion changes over time I think. By now, I would prefer a system capable of think and act LOGICALLY like human in a dynamic domain (background knowledge changes over time) through self-learning(Machine learning).