According to Wikipedia, in education terminology, rubric means "a scoring guide used to evaluate the quality of students' constructed responses". They usually contain evaluative criteria, quality definitions for those criteria at particular levels of achievement, and a scoring strategy.
Often presented in table format, they can be used by teachers when marking, and by students when planning their work.
There are many rubric creation tools. Quick Rubric is a powerful one that allows you to create, share, and publish rubrics with minimal effort. The following video shows you how it works.