# Data in Wolfram|Alpha

## How much data is there in Wolfram|Alpha?

Many trillions of elements, continually growing through a large number of feeds.

## Does Wolfram|Alpha get its data from the web?

No. It comes from Wolfram|Alpha's internal knowledge base. Some of the data in that knowledge base is derived from official public or private websites, but most of it is from more systematic primary sources.

## Where does Wolfram|Alpha's data come from?

Many different sources, combined and curated by the Wolfram|Alpha team. At the bottom of each relevant results page there's a "Source information" button, which provides background sources and references.

## Can I find the origin of a particular piece of data?

Most of the data in Wolfram|Alpha is derived by computations, often based on multiple sources. A list of background sources and references is available via the "Source information" button at the bottom of relevant Wolfram|Alpha results pages.

## How is Wolfram|Alpha's data checked?

We use a portfolio of automated and manual methods, including statistics, visualization, source cross-checking, and expert review. With trillions of pieces of data, it's inevitable that there are still errors out there.

## How often is the data in Wolfram|Alpha updated?

Many kinds of data—such as financial or weather—stream in all the time. Other kinds of data are updated when they become available, on a daily, weekly, monthly, or yearly basis.

## What should I do if I find an error in Wolfram|Alpha's data?

Tell us! We're always working hard to perfect the quality of our data.

## How may I use data from Wolfram|Alpha?

You can use individual pieces of data however you want. There are, however, restrictions on aggregate uses, as described in the Terms of Use. Please contact us if you're wondering about a particular use.

## Does Wolfram|Alpha stand behind the data it uses?

Yes. Although we must rely on external sources for many kinds of raw data, we curate all data and our goal is to make sure that it is perfect.

## How is real-time data curated?

Wolfram|Alpha effectively checks real-time data (such as weather, earthquakes, market prices, etc.) against built-in criteria and models. If an unexpected deviation is found, Wolfram|Alpha will normally indicate it, for example by showing lines as dashed.

## How much of Wolfram|Alpha's data comes from Wikipedia?

Most of the data comes directly from primary sources. However, Wikipedia contains excellent "folk information" about everyday practices in many domains, about the popularity and names of things (such as "the big apple" for NYC, and so on). Wolfram|Alpha uses such information especially for linguistic disambiguation.