Literal types in TypeScript allow you to specify the exact value a variable can hold, rather than just the general type. This feature lets you constrain variables to specific string, number, or boolean values, making your code safer and more predictable. Literal types are especially useful when you want to limit a variable to a small set of allowed values, such as a status indicator or a set of commands.

You can combine literal types with union types to allow a variable to accept only a specific set of values. This is common when you are working with options that should be strictly controlled, such as days of the week, user roles, or specific command strings. Using literal types in this way gives you more control and helps prevent bugs caused by invalid values.