Internet users in the United States likely did not notice anything different this week when they were looking at websites. But some rules governing the internet changed a lot. Businesses that provide internet service are now permitted to block, slow down, or speed up access to some web sites. They may also require companies, such as YouTube or Amazon, to pay to show users their videos, stories, or pictures faster. The change marks the end of rules known as “net neutrality.” Former U.S. President Barack Obama put the rules in place in 2015. In the term net neutrality, “net” is a short way of saying “internet.” Under its rules, government regulations required internet service providers to treat websites and applications in the same way. But earlier this year, government officials, supported by President Donald Trump, voted to end those rules. Their decision took effect on Monday.