On Windows Support and Apple Support, you can choose to let the OS manage this for you, which sets the default to the printer you used most recently at your current location. Why Is It Useful?

However, the concept of the default printer is not without its pitfalls. The most common frustration arises when a user’s context changes. A laptop user might set a printer as the default at the office, but when they bring the laptop home and hit "Print," the computer may still try to send the job to the office printer, resulting in a confusing error message or a stalled print queue. This highlights the importance of managing default settings. Modern operating systems have become smarter, often allowing location-based printing, where the default printer changes automatically based on which Wi-Fi network the device is connected to. This evolution acknowledges that the "default" is not always static; it is a dynamic preference based on the user's environment.

When you click "Print" in a document or web browser, the default printer is already highlighted in the settings menu.

How Default Printers Simplify Printing Tasks in Multi ... - Lenovo

Furthermore, the selection of a default printer carries economic and practical implications. Accidentally setting a high-end photo printer as the default can lead to wasted expensive ink and paper when printing mundane web pages or shipping labels. Conversely, setting a slow, low-quality printer as the default can bottleneck productivity in a busy office. Therefore, choosing a default printer requires a strategic assessment of which device offers the best balance of speed, cost, and quality for the majority of one's tasks.

At its core, a default printer is the printing device that a computer automatically selects when a user initiates a print command. In any given office or home environment, a computer might be connected to several different printers—perhaps a high-speed laser printer in the hallway, a color inkjet in the spare bedroom, or a virtual printer used to create PDF files. Without a designated default, the user would be forced to manually select a specific machine every single time they wanted to print a document. The default printer setting bypasses this repetitive step, telling the operating system: "Unless I tell you otherwise, send all my work here."

: Saves time by reducing the number of clicks required for each document.