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Credit Jason Henry for The New York Times

Your digital footprint can quickly extend far and wide and be used in multiple ways. Your interactions on Facebook shape the ads you see there. The kinds of films and music you stream may allow online companies to make inferences about your political leanings or religious beliefs. And your health insurer may analyze details about your online shopping habits.

How much control do you have over how companies collect and use your information? And what mechanisms are in place to protect your data against misuse?

If you are in the United States or Europe, the answers vary, which has led to tensions between officials and disputes with companies. In the United States, a variety of laws apply to specific sectors, like health and credit. In the European Union, data protection is considered a fundamental right, which can have far-reaching consequences in all 28 member states.

All the talk about data privacy can get caught up in political wrangling. But the different approaches have practical consequences for people, too.

  1. That One Bad Night

    You made a stupid mistake 10 years ago, pulling a harmless prank while at college that led to your arrest and to misdemeanor charges that were eventually dropped. Your record was spotless before and has been since. But that mistake follows you online, since a local newspaper wrote about the arrest and the article shows up when anyone searches for your name online. What’s your recourse?

  2. In Europe

    The so-called right to be forgotten legal decision allows you to ask search engines like Google and Microsoft’s Bing to remove links to the news article on European versions of those sites. (The news article remains available on the newspaper’s website.)

  3. In the U.S.

    The First Amendment of the Constitution protects freedom of expression, including the right of an individual to speak freely. There is no blanket ruling that allows people to delete or remove negative information about themselves online.

  4. Surprise! Your Bank Has Been Hacked

    You have just received your monthly credit card bill after the holiday season. There are many luxury purchases you don’t recognize. Your card details — and those of thousands of other customers — have been stolen by hackers.

  5. In Europe

    Under new rules that will come into force over the next two years, any company must notify national regulators within three days of discovering a breach or face fines for not sufficiently protecting your data.

  6. In the U.S.

    Notification requirements vary by industry under federal law. Financial institutions, for example, are required to tell customers as soon as possible if a data breach could lead to misuse of personal information. However, companies may delay these disclosures if law enforcement officials determine that notifying customers could interfere with a criminal investigation.

  7. All Those Clicks Add Up

    You do thousands of searches on Google each year. You have hundreds of Twitter followers. And you have become addicted to the shopping and video services available through Amazon Prime. What information do these companies have on you?

  8. In Europe

    You can ask any company — for a modest administration fee — to send you details about what data it holds on you and what that information is used for. In most cases, companies must hand over the files within a month. In practice, the process is not always so smooth; some companies have declined to provide people with the data they had requested.

  9. In the U.S.

    There is no single federal law or standard people can rely on to obtain copies of their records. But there are industry-specific rules. Patients, for instance, may request copies of their medical records from health-care providers. Some companies, like Twitter, also allow customers to download their own archives.

  10. My Child Has Fallen for Video Games

    Your 10-year-old wants to set up a player profile on an online video game that collects personal information including children’s real names, locations, photos and email addresses.

  11. In Europe

    Currently, there are no European-wide laws that apply specifically to how children’s data can be collected and used. Under new rules to come into force over the next two years, digital services like Facebook, Snapchat and Instagram must obtain parental consent before collecting data on anyone under 16 (and national governments can lower that age limit to 13).

  12. In the U.S.

    A federal law called the Children’s Online Privacy Protection Act requires children’s sites and apps to obtain parental permission before collecting personal details – like names and email addresses – from children under 13. The Federal Trade Commission enforces these protections.