Minecraft is an awesome game to play. You can play it on almost any platform (Ps4, Ps3, Pc, Xbox ,Nintendo, Mobile and a lot more). It has more than 200 milion copies by 2020. It was published in 2009 and is still growing strong.
It is not free it is less than €30 to download on PlayStation and on a disc for PlayStation it is less than €50. On Pc you can get it for €15. On mobile it is €8.
You can play with your friends online or competitive with strangers. It has two gamemodes
1) Survival it is a nice gamemode were you play and you can die and need to gather your resources to build and need to survive. There are also Hostile Mobs they are mobs that can cause you damage and potentially kill you.
2) Creative in creative you give more emphasis to your creativity and you can build with out needing to gather your resources on your own except you can find any material you want with a single click.
Minecraft was developed by Mojang who is now owned by Microsoft.
On my opinion Minecraft is a GREAT game for playing alone or with your friends. I have got Minecraft from 2015 and i will never get bored playing it.
I give it a 10/10 for sure.