A play-by-post game (PbP) is an online text-based role-playing game. This is a niche area of the online roleplaying community which caters to both gamers and creative writers. PbP games are often based on other role-playing games, non-game fiction, or original settings. This activity is closely related to both interactive fiction and collaborative writing.

Interactive fiction, often abbreviated IF, describes software simulating environments in which players use text commands to control characters and influence the environment. Works in this form can be understood as literary narratives and as computer games. In common usage, the word refers to text adventures, a type of adventure game with text-based input and output. The term is sometimes used to encompass the entirety of the medium, but is also sometimes used to distinguish games produced by the interactive fiction community from those created by games companies. It can also be used to distinguish the more modern style of such works, focusing on narrative and not necessarily falling into the adventure game genre at all, from the more traditional focus on puzzles.

The term collaborative writing refers to projects where written works are created by multiple people together (collaboratively) rather than individually. Some projects are overseen by an editor or editorial team, but many grow without any of this top-down oversight.

The third-person narrative is narration in the third person. The participants in the narrative are understood to be distinct from the person telling the story and the person to whom, or by whom, it is read. Third-person narrative is one of three possible modes of narration. The others are first-person narrative, in which the narrative voice is the protagonist of the narrative, referred to in the first person, as I or we, and (rarely) second-person narrative, in which the protagonist is remembered and said as second person, as "you". Third person can be omniscient or limited. It depends on how many thoughts you know from each character.

Third person limited is where the narrator describes events in third person grammar but as if seen through the eyes of only one character (hence "limited"), the protagonist. The narrative will include the thoughts and feelings of only the protagonist, while other characters are presented externally. Since the reader learns the events of the narrative entirely through the perceptions of the protagonist, anything that the protagonist cannot perceive must be excluded from the narrative otherwise it "breaks" the point of view. Because of this, third person limited is sometimes called the "over the shoulder" perspective.

An omniscient narrator, as in more limited third-person forms, is also disembodied; it takes no actions and has no physical form in or out of the story. But, being omniscient, it witnesses all events, even some that no characters witness. The omniscient narrator is privy to all things past, present and future - as well as the thoughts of all characters. As such, an omniscient narrator offers the reader a bird's-eye view about the story. The story can focus on any character at any time and on events where there is no character. The third-person omniscient narrator is usually the most reliable narrator; however, the omniscient narrator may offer judgments and express opinions on the behavior of the characters.

Fiction is the telling of stories which are not entirely based upon facts. More specifically, fiction is an imaginative form of narrative, one of the four basic rhetorical modes. Although the word fiction is derived from the Latin fingo, fingere, finxi, fictum, "to form, create", works of fiction need not be entirely imaginary and may include real people, places, and events. Fiction may be either written or oral. Although not all fiction is necessarily artistic, fiction is largely perceived as a form of art or entertainment. The ability to create fiction and other artistic works is considered to be a fundamental aspect of human culture, one of the defining characteristics of humanity.

Internet forums are the most common medium for Play-by-Post gaming. Some online forums provide benefits such as online dice rolling, character profiling and game history. Others emphasize the use of free-hand and the absence of dice and chance. Thanks to online forums, players can easily keep track of all aspects of the game, can see what is happening elsewhere and can re-read anything they have previously written. Many online services provide free game hosting for gamemasters. Such as GaiaOnline