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The DSA is designed to keep users safe online and that's either illegal or violates a platform's terms of service, such as promotion of genocide or anorexia. It also looks to protect Europeans' fundamental rights like privacy and free speech.

Some online platforms, which could face billions in fines if they don't comply, already have made changes.

Here's a look at :

WHICH PLATFORMS ARE AFFECTED?

So far, 19. They include eight social media platforms: Facebook; TikTok; ; YouTube; Instagram; LinkedIn; Pinterest; and Snapchat.

There are five online marketplaces: Amazon, , China's and Germany's Zalando.

Mobile app stores Google Play and Apple's App Store are subject, as are Google's Search and Microsoft's Bing search engine.

Google Maps and Wikipedia round out the list.

WHAT ABOUT OTHER ONLINE COMPANIES?

The EU’s list is based on numbers submitted by the platforms. Those with 45 million or more users — or 10% of the EU’s population — face the DSA’s .

Brussels insiders, however, have pointed to some notable omissions, like eBay, Airbnb, Netflix and even PornHub. The list isn't definitive, and it's possible other platforms may be added later on.

Any business providing digital services to Europeans will eventually have to . They will face fewer obligations than the biggest platforms, however, and have another six months before they must fall in line.

WHAT'S CHANGING?

Platforms have rolled out new ways for European users to and dodgy products, which companies will be obligated to take down quickly and objectively.

The DSA “will have a significant impact on the experiences Europeans have when they open their phones or fire up their laptops,� Nick Clegg, Meta's president for global affairs, said in a blog post.

Facebook and Instagram's existing tools to report content will be easier to access. Amazon opened a new channel for reporting suspect goods.

an extra option for flagging videos, such as for hate speech and harassment, or frauds and scams, which will be reviewed by an additional team of experts, according to the .

Google is offering more “visibility" into content moderation decisions and different ways for users to contact the company. It didn't offer specifics. Under the DSA, Google and other platforms have to provide more information behind why posts are taken down.

Facebook, Instagram, TikTok and Snapchat also are giving people the option to turn off automated systems that recommend videos and posts based on their profiles. Such systems have been blamed for .

The DSA also prohibits targeting , including children, with ads. Platforms like Snapchat and TikTok will stop allowing teen users to be targeted by ads based on their online activities.

Google will provide more information about targeted ads shown to people in the EU and give researchers more access to data on how its products work.

IS THERE PUSHBACK?

Zalando, a German online fashion retailer, has filed a legal challenge over its inclusion on the DSA's list of the largest online platforms, arguing that it's being treated unfairly.

Nevertheless, Zalando is launching content flagging systems for its website even though there's little risk of illegal material showing up among its highly curated collection of clothes, bags and shoes.

The company has supported the DSA, said Aurelie Caulier, Zalando's head of public affairs for the EU.

“It will bring loads of positive changes� for consumers, she said. But “generally, Zalando doesn’t have systemic risk (that other platforms pose). So that’s why we don’t think we fit in that category."

with a top EU court.

WHAT IF COMPANIES DON'T FOLLOW THE RULES?

Officials have warned tech companies that violations could bring fines worth up to 6% of their global revenue — which could amount to billions — or even a .

“The real test begins now,� said European Commissioner Thierry Breton, who oversees digital policy. He vowed to “thoroughly enforce the DSA and fully use our new powers to investigate and sanction platforms where warranted.�

But don't expect penalties to come right away for individual breaches, such as failing to take down a specific video promoting hate speech.

Instead, the DSA is more about whether tech companies have the right processes in place to that their algorithm-based recommendation systems can inflict on users. Essentially, they'll have to let the European Commission, the EU's executive arm and top digital enforcer, look under the hood to see how their algorithms work.

EU officials “are concerned with user behavior on the one hand, like bullying and spreading illegal content, but they’re also concerned about the way that platforms work and how they contribute to the negative effects,� said Sally Broughton Micova, an associate professor at the University of East Anglia.

That includes looking at how the platforms work with digital advertising systems, which could be used to profile users for harmful , or how their livestreaming systems function, which could be used to instantly spread terrorist content, said Broughton Micova, who's also academic co-director at the Centre on Regulation in Europe, a Brussels-based think tank.

Big platforms have to identify and assess potential systemic risks and whether they're doing enough to reduce them. These assessments are due by the end of August and then they will be independently audited.

The audits are expected to be the main tool to verify compliance — though the EU's plan has faced criticism for lacking details that leave it unclear how the process will work.

WHAT ABOUT THE REST OF THE WORLD?

Europe's changes could have global impact. Wikipedia is tweaking some policies and modifying its terms of use to provide more information on “problematic users and content.� Those alterations won’t be limited to Europe and "will be implemented globally," said the nonprofit Wikimedia Foundation, which hosts the community-powered encyclopedia.

“The rules and processes that govern Wikimedia projects worldwide, including any changes in response to the DSA, are as universal as possible," it said in a statement.

Snapchat said its new reporting and appeal process for flagging illegal content or accounts that break its rules will be rolled out first in the EU and then globally in the coming months.

It's going to be hard for tech companies to limit DSA-related changes, said Broughton Micova, adding that digital ad networks aren’t isolated to Europe and that social media influencers can have global reach.

The regulations are “dealing with multichannel networks that operate globally. So there is going to be a ripple effect once you have kind of mitigations that get taken into place," she said.

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AP videojournalist Sylvain Plazy contributed from Brussels.