Bribery can be a crime in more serious cases, such as when a person offers money to hide their own wrongdoing. If a motorist is caught speeding by a policeman and offers the policeman money or a bottle of vodka to persuade him not to report him, that is bribery. If someone wants to take something into a country that is forbidden (or that they would have to pay tax on), they might offer the customs officer a bribe to persuade him to let them through. Some corrupt people will not do their jobs at all (like delivering some package) unless they get a bribe on top of their normal pay.