Any object that can be placed into a level. They are a generic Class that support 3D transformations such as translation, rotation, and scale. They can be created (spawned) and destroyed through gameplay code

• Actor

• AI Controller

• Characters

Possesses a Pawn to represent a non-player character (NPC) in a game.

• Actors

• AI Controller

• Brushes

• Characters

Is an Actor that describes a 3D volume that is placed in a level in order to define level geometry (referred to as BSPs) and gameplay volumes. Used to block-out your levels for gameplay testing

• brushes

• actors

• AI Controller

• characters

Is a subclass of a Pawn Actor that is intended to be used as a player.. It subclass includes a collision setup, input bindings for bipedal movement, and additional code for movement controlled by the player.

• Actor

• AI Controller

• Brushes

• Characters

Defines the behaviors and properties of a particular Actor or Object used in the creation of an Unreal Engine game.

• Classes

• Components

• GameModes

• Game States

Is a piece of functionality that can be added to an Actor. cannot exist by themselves, however when added to an Actor, the Actor will have access to and can use functionality provided by it

• Classes

• Components

• GameModes

• Game States

Class is responsible for setting the rules of the game that is being played. The rules can include how players join the game, whether or not a game can be paused, and level transitions, as well as any game-specific behavior such as win conditions.

• Classes

• Components

• Game Modes

• Game States

Contains the information that you want replicated to every client in a game. It often contains information about game score, whether a match has started or not, how many AI to spawn based upon the number of players in the world, and other game specific information.

• Classes

• Components

• GameModes

• GameStates

Is a user defined area of gameplay. They are created, viewed, and modified mainly by placing, transforming, and editing the properties of the Actors it contains.

• Levels

• Objects

• Pawns

• PlayerController

The base building blocks in the Unreal Engine and contain a lot of the essential "under the hood" functionality for your game assets. Just about everything in Unreal Engine 4 inherits (or gets some functionality) from them

• Levels

• Objects

• Pawns

• PlayerController