QR codes are two dimensional images that are recognised by software to represent links, addresses or information, software on mobile phones and specialist hardware are able to read the code and translated it into the original text or link.
You can embed these codes in your website, email content or PDF content eg invoices or certificates.
You can use this free service to create your QR codes: http://goqr.me/api/doc/create-qr-code/
Use it to create codes like this:
https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=https://ww...
you can create HTML code like this:
<img alt="" src="https://api.qrserver.com/v1/create-qr-code/?size=150x150&data=https:..." style="height:150px; margin:5px; width:150px" />
You can therefore create links to some common tasks:
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Update process steps, eg attendance on a course
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Automatically log into the student portal
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Automatically log into the trainer portal
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Update a USI for a student
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Your own website, facebook page or other social media activity (liking your page for instance).