You have the right to:

• information about the processing of your personal data;
• obtain access to the personal data held about you;
• ask for incorrect, inaccurate or incomplete personal data to be corrected;
• request that personal data be erased when it’s no longer needed or if processing it is unlawful;
• object to the processing of your personal data for marketing purposes or on grounds relating to your particular situation;
• request the restriction of the processing of your personal data in specific cases;
• receive your personal data in a machine-readable format and send it to another controller (‘data portability’);
• request that decisions based on automated processing concerning you or significantly affecting you and based on your personal data are made by natural persons, not only by computers. You also have the right in this case to express your point of view and to contest the decision.

To exercise your rights you should contact the company or organisation processing your personal data, also known as the controller. If the company/organisation has a Data Protection Officer('DPO') you may address your request to the DPO.

The company/organisation must respond to your requests without undue delay and at the latest within 1 month. If the company/organisation doesn't intend to comply with your request they must state the reason why.

You may be asked to provide information to confirm your identity (such as, clicking a verification link, entering a username or password) in order to exercise your rights.

These rights apply across the EU, regardless of where the data is processed and where the company is established. These rights also apply when you buy goods and services from non-EU companies operating in the EU. 

Source: European Commission