Ansible is automation tool for making infrastructure as code. Helps with managing multiple servers/machines from one code base, making sure all the servers where the ansible is executed have the same configuration. Ansible is agentless, does not need installing ansible on target machine, only python interpreter.

Nodes

Control Node (From which is ansible executed to managed nodes)
Managed Node (Server/Machine which we are managing such as remote hosts, PC-s, servers, embedded devices)

Ansible Repo (dir)

Consists of several parts:

Inventory (Holds hosts to manage)
Playbooks (What should be executed on the target host)
Modules
Ansible Configuration

Playbooks

Set of plays which are executed on target machine.
Each play has a set of tasks
Multiple repetetive tasks can be group inside ROLES
ROLES (Tasks, Handlers, Vars, Plugins, Templates, Files)