Entities are a special type of data model that provide a way to represent and store information in an organized and efficient manner. They are commonly used to store information in databases and provide an efficient way to query and manipulate data. Entities can also be used to provide a structure and context to a software project, which helps ensure that the project remains organized and manageable. At its core, an entity is nothing more than a set of attributes and relationships that relate those attributes to other entities. For example, if a database stores information about employees, the entity could include information such as name, title, and salary. The relationships that are established between the attributes and other entities provide the context that allow the data to be queried and manipulated. For example, the database could be queried to identify all employees that have a title of “manager”. Entities are especially useful when dealing with complex data. For example, an entity could include a primary key, which uniquely identifies it and is used to reference the related records in other tables. A strong entity model can reduce redundancy in a database, which means fewer records need to be stored and manipulated, making queries more efficient and accurate. This makes entities a powerful tool for dealing with large volumes of data, making them an essential part of many applications and systems.