Command Block:A command block is a block that can execute Commands it cannot be crafted but is given to a player by putting a certain command in the chat.To get a Command block just put in the chat /give (player name) minecraft:command_block
Some commands can be downloaded from the internet and can add things to your game.There is a very famous website that makes command "mods".Here is the link to the website:http://mrgarretto.com/.REMEMBER:ALWAYS PUT THE COMMANDS IN THE COMMAND BLOCK,NOT IN THE CHAT
Some very easy fun commands: Command to summon Ender Dragons anywhere:/summon Ender Dragon
Command to put blocks on your head:/replaceitem entity @p slot.armor.head (block of choice)
REMEMBER:IF THE BLOCK'S ID IS COMPOSED BY TWO WORDS,PUT AN UNDERSCORE BETWEEN THE TWO WORDS EXAMPLE:diamond_block
