Political corruption is generally defined to mean the misuse of public office for private gain.
An evocative example of political corruption would be a politician pocketing tax-payer money from the U.S. Treasury.
But political corruption takes many forms and is often subtler than this.
In addition to using a position in government to extract benefits from government revenue, a position in government may be used to extract benefits from the private sector.
Examples of this include soliciting payments from a business or industry in exchange for more favorable policy.
In addition to such economic improprieties, political corruption also includes social improprieties.