What is the reason for websites adjusting the default font size to 14px?

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The reason for websites adjusting the default font size to 14px is to provide a comfortable reading experience for most users. Studies have shown that a font size of around 14px is easy to read for the majority of people and does not cause eye strain or require excessive squinting or zooming. Additionally, a larger font size may be helpful for users with visual impairments or those using smaller screens or devices.