The holy grail of exoplanets research is to find an Earth-like planet in the habitable zone around its star (where it's not too hot and not too cold for life to exist) and then study its atmosphere with the James Webb Space Telescope to determine if life is present there.
But to do that, we have to find these planets first.
This is where the TESS mission comes in; this month a research paper was published claiming to have found TWO possible Earth-like planets in the habitable zone.
The hope is that we can use JWST to study at least one of them.