
— Justin
Hi Justin.
Yes, the terminology can be confusing! Let’s start with some definitions.
What is a Windows Service?
A Windows Service:
- Is a Windows application that integrates with the Service Control Manager.
- Is controlled through the Services Control Panel application.
- Implements system-level tasks that must operate outside the boundaries of a user’s login session.
- Is usually long-running, starting when the computer boots and running uninterrupted, 24/7.
- Works invisibly in the background. A service can’t easily show itself on a user’s desktop.
- Can do anything that a “regular” application can. Services can read and write files, print documents, check the time, access the network, and much more.
- Runs on Windows only. Windows Services are not available on Linux, macOS, Andriod, iOS or any other operating system.
- Is typically written in C++ or C# (to best work with the low-level Windows Services API).
- May or may not communicate with other programs. Inter-application communication is not a key feature and most services do not expose an interface of any kind.
A modern PC comes with one to two hundred Windows Services pre-installed, each managing an important aspect of your computing experience. For example:
Print Spooler: Manages all printing on your computer.
Power: Implements your computer’s power schemes, policies and notifications.
Task Scheduler: Responsible for automatically launching executables, batch files and scripts at specified times, without human intervention.
What is a Web Service?
A Web Service:
- Interacts with other applications or services using a well-defined system of data exchange (such as REST or SOAP).
- Typically communicates over HTTP with an appropriate messaging format on top (such as XML or JSON).
- Is usually hosted in a web server/container, like Apache Tomcat, Microsoft IIS or Play Framework. A good framework provides easy-to-use messaging “plumbing” and makes it significantly simpler to develop a robust web service.
- Has a web-based interface (if any at all).
- Is not restricted to Windows alone. In fact, most web services are deployed on UNIX servers.
Examples of web services include:
![]() | Amazon Simple Storage Service (S3): Integrate cloud storage into any application. |
![]() | Google Maps: Lookup addresses, plot directions, access street views and more. |
![]() | WorldTimeAPI: Get the current time in any time zone. |
The upshot: Windows Services and Web Services are very different!
The only things they have in common are that they are both server technologies and have the word “Service” in their names. 🙂 As a developer, you shouldn’t have much trouble choosing which technology is appropriate for your project.
However, the W* Services are not completely complementary. Though rare, there are a few applications that are both a Windows Service and web service. A good example is our own AlwaysUp Web Service, which must run 24×7 on Windows while providing an XML web service to control the computer remotely.
I hope these similar-sounding technologies make a bit more sense now. Please be sure to get in touch if you have any other questions.






Malware authors are known to keep on eye out on Microsoft’s monthly security updates, select the most useful bugs, and patch-diff the security updates to find the exact bug that Microsoft fixed — so they can weaponize it as soon as possible.
































