Definitions for "Todo"
On the server side, a a component of a calendar that specifies something to be done. In Calendar Express on the client side, a todo is called a task.
a calendaring and scheduling entity that represents an action-item or assignment
A todo is also known as a task item. Generally speaking, people use todos for activities that are either not linked to a specific date and time or activities that are not linked to any contact.
Keywords:  things, need, day, list, you
a list of the things you need to do on that day