A major chord tends to affect the emotions with a "pleasant" feeling. A minor chord may have you feel the opposite-tense, apprehensive, even sad.
There's some science behind why our brain interprets major/minor chords the way do.
https://www.google.com/amp/s/www.nme.com/blogs/nme-blogs/the-science-of-music-why-do-songs-in-a-mino...