# Lists A list is an **sequence of values**. It may have properties such as being sorted/unsorted, having duplicate values or being unique. The most important part about list structures is that the data has an ordering (which is not the same as being sorted). Ordering simply means that there is an idea that there is a "first" item, a "second" item and so on. Lists typically have a subset of the following operations: * initialize * add an item to the list * remove an item from the list * search * sort * iterate through all items * and more... A list may implement only a subset of the above functionality. The description of a list is very general and it can be implemented in a number of different ways. Two general implementation methods are the array method or the linked list method. We will look at each in turn. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://catherine-leung.gitbook.io/data-strutures-and-algorithms/lists.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.