OpenDocument Format is standardised by OASIS and adopted by ISO/IEC JTC1 SC34. ODF is the current best practice for sharing and storing office documents across the industry. ODF makes your documents such as texts or presentations more portable across operating systems and devices by allowing you to attach the fonts you use to a document.
Are you using a productivity tool that cannot yet embed fonts in your documents? With this free online tool based on the open source WebODF you can easily embed any font you want.
With ViewerJS you can then for instance include a great looking document straight into your website, without any further dependencies.
We live in a time where people and organisations you have to interact with all around the world - customers, employees, citizens and vendors - work with a multitude of devices (workstation, laptops, tablet, mobile devices) from different vendors in many different circumstances. Including your fonts makes sure that your audience sees your document as you intended.