It might sound strange for some to ask something so basic. However you will see that it is defined differently according to what expertise or background it is explained from. And even though there is a lot of talk about AI nowadays. A real artificial intelligence(general intelligence) as of yet has not been produced.

The reasoning and observation of things separate from ourselves as information coming in is already a certain effort that we make, a perception that we create ourselves. The act of witnessing is often using a certain frame of knowledge to look at a certain facet of the entirety. In fact it is a blocking out of everything except what you wanna see. You are in that really looking at your own perception rather than something actually out there.

To look at anything without forming a believe and or attachment from the realisation or insight that there is no real connection only one formed in your brain relating to other experiences. Having that insight causes you to stay detached or not even entertain the thought of stepping into an illusory form of thinking.

people with the desire to be smart always end up being mean