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?
Its hard to say what the most popular are.
Star Wars is sorta explicitly not psionics, the force is an outside thing that force users can tap into.
Mass effect has psionics, but psionics in general play a really minor role, some psionic characters play big roles, but them being psionic is meh.
Warhammer 40K might be the most popular franchise where psionics plays a major role. Every major faction except the Necrons are defined/driven by their psionics.
Star Trek has some psionics, but those are generally minor plot points, not major ones.
Dune has the Atreides be psionic, the Bene-Gesserit are arguably psionic, as are the navigators.
Akira is all about psionics, and is arguably Sci-Fi, if a grittier, closer to current reality one.
Arguably the most popular series with psionics is Star Trek.
Arguably the most popular series where psionics plays a large role is either Dune or Warhammer 40K. Warhammer 40K has probably made more money, but I think more people have read Dune.