# Structs
ListItem it is an entity that represents M:M relation of Lists to Todos.
TodoItem it is an entity that represents user's single todo.
Todolist it is an entity that represents user's list of todos.
UpdateItemData it is a DTO for passing data to the Todo service layer.
UpdateListData it is a DTO for passing data to the List service layer.
User it is an entity of end user for this application.
UsersList it is an entity that represents M:M relation of Lists to Users.