Board Thread:Boruto Discussions/@comment-4683088-20180214100611

Spin-off: It's a series created basing off an existent work. It takes some things of the other, it could be: the main character, the place that facts ocurred or the fictional universe of original work.

Sequel: It's a continuation of a complete work and it ocurres at the same universe but in a post-time. It resumes the facts just like the complete work left, but sometimes it could have a little some differences.

So... Boruto is a spin-off and a sequel. 