With Ubisoft Connect the Ubisoft company is aiming to have all its games support cross-play and cross-progression. Cross-play will allow you to play with people on different consoles and cross-progression carries over your save data across platforms.
Further information on their website tells us the following:
Ubisoft Connect is the ecosystem of players services for all Ubisoft games across all platforms. It is the unification and improvement of Ubisoft Club, our loyalty program, and Uplay, our Desktop App, across all platforms. It aims at giving the best environment for all players to enjoy their games and connect with each others whatever the device.
All Ubisoft live games and new releases will support Ubisoft Connect services and loyalty program.
On our back catalogue games, you will be able to access Ubisoft Connect services (stats, leaderboard, Smart Intel when applicable), but the challenge system is inactive. As a consequence, we have decided to offer you all the rewards available on these games: you now have more than 1.000 Rewards for free to enjoy!
Immortals Fenyx Rising is one of the first games that will support this.
Source: Nintendo Everything