The term "turn-based strategy game" (TBS) is usually reserved for certain computer strategy games, to distinguish them from real-time computer strategy games. A player of a turn-based game is allowed a period of analysis before committing to a game action.
TBS games come in two flavors, differentiated by whether players make their plays simultaneously or take turns. The former types of games are called simultaneously-executed TBS games, with Diplomacy a notable example. The latter games fall into the player-alternated TBS games category, and are subsequently subdivided into (a) ranked, (b) round-robin start, and (c) random, the difference being the order under which players take their turns. With (a), ranked, the players take their turns in the same order every time. With (b), the first player is selected according to a round-robin policy. With (c), random, the first player is, of course, randomly selected.
Almost all non-computer strategy games are turn-based; however, the personal computer game market trend has lately inclined more towards real-time games. Some recent games feature a mix of both real-time and turn-based elements thrown together.