What is 'QAnon'? Understanding the far-right conspiracy movement embraced by Trump supporters that originated on 4chan.

A man on Wall Street in lower Manhattan holds a "Who is Q?" sign in August 2019.Ben Gilbert/Business Insider

• Over the past several years, a set of conspiracy theories tied to a fictional character named "Q" have leapt from the anonymous 4chan online message boards to the slogans chanted and signs held by President Trump's supporters at campaign rallies.
• The various theories tied to "Q" and "QAnon" are voluminous, but the general idea is that elites, Democratic Party leaders, and the so-called "Deep State" are all conspiring on a variety of nefarious acts, from pedophilia to mind control.
• "Q" – supposedly a secret person or persons with access to confidential information – is the origin of the conspiracies, which largely serve to present President Trump in a flattering light.
• On Tuesday night, Twitter announced action against QAnon-related content on its platform. The social media company said it banned over 7,000 accounts tied to the conspiracy theory, among other moderation efforts.

For years, supporters of QAnon have peddled false conspiracy theories online, based in the belief that elites, Democratic Party leaders, and the so-called "Deep State" are all conspiring on a variety of nefarious acts, from pedophilia to mind control.

Many people quickly dismiss these provably false theories. But for adherents of "Q" — who are also largely supporters of President Donald Trump — these conspiracies are core to an increasingly popular set of beliefs.

Here's everything we know about QAnon: