Amazon (AMZN -0.64%) is getting a lot of attention after announcing a 20-for-1 stock split on March 9. Shareholders must approve the move on a vote on May 25 before it can go into effect.

Regardless, the change will not impact ownership percentages for shareholders. But there are more prominent reasons to be excited about Amazon stock. Keep reading to find out what those are. 

A person opening a package while sitting on a couch.

Image source: Getty Images.

1. Amazon web services is accelerating 

Amazon reports operating-income results from three distinct segments: North America, international, and Amazon Web Services (AWS). In the year ended Dec. 31, Amazon reported $24.9 billion in operating income. Of that total, $18.5 billion came from AWS.

Similarly, in 2020, Amazon earned $22.9 billion in operating income, and $13.5 billion was derived from AWS. The coronavirus pandemic accelerated the adoption of cloud computing, and as a result, AWS is thriving.

AMZN Operating Income (TTM) Chart

AMZN Operating Income (TTM) data by YCharts.

Fortunately for shareholders, the trend is unlikely to reverse because for businesses, the move to cloud computing replaces a considerable, upfront fixed cost with a smaller recurring cost, based on usage. In its fourth-quarter ended Dec. 31, AWS generated $17.8 billion in revenue. That was up by 40%, compared to the same quarter of the prior year. What's more, AWS has grown revenue at an accelerating rate for four consecutive quarters.

Businesses typically sign long-term contracts with Amazon for cloud services. As of Dec. 31, 2021, the average length of these long-term contracts was 3.8 years.

It's not like there was a boom during the pandemic that will quickly snap back in the aftermath. The value of these contracts is increasing, too. As of Dec. 31, the total value of long-term contracts for cloud services was $80 billion. That figure is up sharply from the $50 billion total at the end of 2020.

2. Amazon is becoming a dominant force in advertising

The second reason to get excited about Amazon stock is its growing revenue from advertising. In the fourth quarter, Amazon generated $9.7 billion in ad revenue. That was up by 33% from Q4 in 2020.

The company is home to more than 200 million Prime members who have access to fast and free shipping on millions of items. Plus, millions more shoppers get fast and free shipping on orders over $25. Both groups of shoppers have payment information on file and are one click away from purchasing. It's no surprise that marketers would be wildly interested in gaining the attention of this powerful buyer network.

In 2021, advertisers spent $763 billion globally, which increased 22.5% from 2020. In recent years, marketers have been allocating more dollars to digital channels because of the ease of measurement and higher return on investment. Digital's share of overall ad spending totaled 64.4% in 2021, up from 52.1% in 2019. According to GroupM, 85% of digital advertising outside China will go to Facebook, Alphabet's Google, and Amazon.

FB Operating Margin (TTM) Chart

FB Operating Margin (TTM) data by YCharts.

Like cloud services, advertising revenue is lucrative and drives higher profit margins than Amazon's retail-sales segment. If you need proof of that, consider Alphabet's and Meta Platforms' operating profit margins over the past several years. 

The proliferation of Amazon's web services and advertising revenue -- two areas with high profit margins -- is undoubtedly more to get excited about than the upcoming stock split