Yes, it is a card game where your cards get special capabilities when you combine certain numbers of the same card.
It is basically a competition to rank as high as possible and win the best rewards setup by the tournament organizers or the administration team at Splinterlands.
There are so many fun activities on splinterlands for example you can collect special cards and sale / rent them out. You can build a solid team to challenge the leaderboard title. You can manage your land farm and extract rare materials for the market. Furthermore, you can stake assets and win even more rare items in the game.
There is a training mode and three different ranking formats for battle. Brawl and tournaments to test the strategies of your friends.
I am sure you will find more in the main page of the game. You will find something that suit you on Splinterlands
Let me know if you Regards