Minecraft Server is necessary for anyone who wants to set up a multiplayer game of Minecraft. Playing the epic sandbox game can be lots more fun in groups, and constructing huge buildings and mines is much easier with help!
Like the game, Minecraft Server doesn't come with instructions and can be challenging for beginners. You can find a tutorial here. In essence setting up takes four steps: 1. Download Minecraft Server. 2. Execute and configure the server. 3. Check your Firewall settings. 4. Open the Minecraft game client and connect to your server. Once you're up and running, your friends can join you using your computer's external IP address. Minecraft will then play as usual, but won't be such a lonely experience!
If you can put the time into setting up Minecraft Server, it can be a lot of fun. However, compared to most commercial games, it's incredibly complex!
The more players you have in Minecraft Server, the more resources it will consume - if your PC is not very powerful, you may notice some lag and fan noise!