Intel (INTC 1.53%) CEO Brian Krzanich frequently highlights the Internet of Things (IoT) as a key growth market for the aging chipmaker. But critics are quick to point out that the segment generated just 5% of its revenues and 3% of the company's operating income last quarter -- so it's hardly a pillar of growth for the company.

Revenue at the business rose 11% annually to $721 million during the quarter, fueled by rising demand for its industrial, video, and automotive chips. But operating income fell 15% to $105 million due to higher investments in driverless cars and other technologies.

Intel CEO Brian Krzanich speaks on stage.

Intel CEO Brian Krzanich. Image source: Intel.

Looking ahead, will Intel's IoT business ever become big enough to be considered a core business? Or will it remain a tiny side business compared to its core PC and data center businesses? Let's take a closer look at four main areas in which Intel's IoT business is expanding.

1. Industrial chips

Intel's IoT chips are used across a wide variety of industries, including manufacturing, healthcare, retail, energy companies, and smart homes. These low-powered chips gather information from various devices and transfer them to cloud-based platforms for analysis. That data helps manufacturers optimize production lines, lets healthcare providers track patients' vital signs, and enables energy companies to distribute energy more efficiently.

These chips work together with connectivity hardware from other big companies like Cisco, which supplies networking hardware and software for many big companies, and General Electric, which integrates machine-to-machine (M2M) chips and software into its industrial hardware.

2. Driverless cars

Intel recently agreed to buy Mobileye (MBLY), the world's largest vendor of ADAS (advanced driver assistance systems), for over $15 billion. Mobileye also produces EyeQ computer vision chips that help vehicles "see" and respond to their surroundings.

A driverless car on a freeway.

Image source: Getty Images.

That purchase will help Intel counter NVIDIA (NVDA -3.22%) and Qualcomm (QCOM -1.36%) in the automotive chip market.

NVIDIA already established a first-mover's advantage in the market with its Tegra chips for infotainment and navigation platforms, as well as its Drive PX platforms for autonomous driving. Qualcomm is quickly catching up with its planned takeover of NXP Semiconductors (NXPI 2.40%), which will make it the biggest automotive chipmaker in the world.

3. IoT video solutions

A crucial core technology in the driverless vehicle push is computer vision. That's why Intel acquired computer vision start-up Movidius last September. Movidius is the developer of Project Tango, a project from Alphabet's Google that creates virtual overlays of real-world surfaces with depth-sensing cameras -- a concept which is related to Intel's own augmented reality headset, Project Alloy. Buying both Movidius and Mobileye should significantly strengthen Intel's own RealSense depth-sensing cameras.

Intel's Project Alloy headset.

Intel's Project Alloy headset. Image source: Intel.

But computer vision isn't just for autonomous cars. Intel is also using these video solutions for autonomous drones, security cameras, secure PCs, and industrial systems. Merging its RealSense tech with its acquired computer vision technologies and Atom processors could widen Intel's moat against potential rivals like Qualcomm -- which is also expanding into cars, drones, and cameras with low-power processors.

4. Wearable devices

Wearable devices -- powered by the button-sized Curie module or SD-card sized Edison chip -- were featured prominently in Intel's earlier promotions of IoT technologies. The company also acquired fitness watchmaker Basis and smart eyewear maker Recon in 2015. Intel secured high-profile partnerships with Google, Fossil, Oakley, and Tag Heuer to develop new fitness trackers and smartwatches. It even put its chips into a wide variety of bracelets and experimental smart clothing.

However, reports of layoffs across the wearables division raised red flags late last year. Intel denied that it was stepping back from wearables, but Qualcomm's recent claim that its ARM-based chips were powering over 80% of the world's Android Wear devices raised serious doubts about Intel's future in wearables. Despite those setbacks, Intel is reportedly still moving ahead with updated versions of its Curie module for fitness trackers, smartwatches, and smart apparel.

Should IoT matter to Intel investors?

Brian Krzanich claims that the IoT and Data Center businesses complement each other, since all the data from those connected devices will be protected and analyzed across cloud-based servers -- most of which use Intel chips.

However, IoT devices powered by chips from other chipmakers, like Qualcomm, also deliver the same data to data centers. Therefore, it might be a stretch to call them complementary businesses. Nonetheless, Intel will likely keep investing in IoT technologies, since the chipmaker estimates that the number of connected devices worldwide could surge to 200 billion by 2020.

While Intel's IoT business certainly won't solve its ongoing troubles in the PC and data center markets anytime soon, staying invested in that market will ensure that the chipmaker doesn't miss another major technological shift, as it did with mobile devices about a decade ago. Therefore, investors should keep an eye on this business -- even if it only generates a single-digit percentage of its overall revenues.