How do I update my Macbook air?
How do I update my Macbook air ?
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An update takes an existing macOS to a slightly higher step.
The companion link which suggests how to do that is above.
While an Upgrade requires a new or newer system download
installer, to be installed from Apple servers; a much larger file.
And this would bring the macOS system to a later full number.
The system number shown in your post, says macOS 10.12.x Sierra.
A next full system series, would be High Sierra 10.13.6 &/or beyond.
• How to get old versions of macOS - Apple Support
https://support.apple.com/en-us/HT211683