What is a guest post and what is it for?

What is a guest post and what is it used for? We've talked before on this blog about guest posting and why it's still a very relevant practice that can greatly help your marketing strategy, especially with link building. But… what exactly is guest posting and what can it do for you?
What should I take into account for a guest post strategy?

Today there are many web applications that can be used without having to download anything. While there are people who prefer to use native applications, today's browsers are powerful enough to run even operating systems from a few years ago. In other words, many web applications will work perfectly from the same browser. In addition, they have the benefit that they can serve without problems on Windows, Linux, macOS, even on iOS and Android. For this reason, many developers will prefer to create a web application in order to support their users in a faster way and without having to invest so much resources and time.