A recent evolution of the term "Euro" has given it the connotation of describing games that are largely solitaire, but historically it was used to denote games that lacked an element of chance (little to no use of shuffled cards, dice, or other sources of randomness), that were often not thematic or based on a licensed property, but that were often _highly_ interactive. Knizia in particular has designed some of the best interactive multiplayer games of all time.
As much as I appreciate the resurgence of interest in board games, I don't love that the designs seeing the most press are narrative games that don't advance the medium or really lend themselves well to the format of tabletop games, but rather seem to be an attempt to bolt on the strengths of video games in a clumsy way.
[1] https://boardgamegeek.com/guild/3948
[2] https://boardgamegeek.com/boardgamefamily/19/series-18xx https://boardgamegeek.com/boardgamepublisher/65/winsome-game...
[3] https://boardgamegeek.com/boardgamepublisher/140/splotter-sp...