What is a to-do list?
A to-do list is an organizational method used to track things that need to be done.  Typically an item is removed from the list after it is accomplished but sometimes to-do lists function to allow someone to prioritize their activities.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What is a to-do list?
### Input: 
### Response: A to-do list is an organizational method used to track things that need to be done.  Typically an item is removed from the list after it is accomplished but sometimes to-do lists function to allow someone to prioritize their activities.