Psionics involve the use of the mind to alter or command reality, typically through some understanding of a deeper truth about the universe or command over a fundamental law of reality.
It’s pretty cool, but I have trouble thinking of media where it takes a prominent role. The few examples that come to mind are:
Star Wars - The Force Mass Effect - Biotics/Element Zero technology Stellaris - Spiritualist Ethos Warhammer 40k - Psykers/Orks
What are some other examples of psionics in Sci-Fi?
Might not be relatively popular, but the psionics of the novel/anime Shin Sekai Yori are central to the plot and are portrayed in a pretty interesting fashion.
Foundation is another (more traditional sci-fi) work which also focuses on psychic people as a central plot point. The book series and TV series are very different, but I’d say each explores the idea well.
For video games, Control is another one I haven’t seen mentioned yet. It’s based on the SCP collaborative fiction project. Exposure to objects of power awaken the protagonist’s (and other characters’) latent psychic abilities.