D2L and Canvas are quite similar in many ways. Both organize material by modules, have discussions, and offer places to submit written assignments. Both have ways for instructors to post announcements to students.
However, some features are slightly different or have a different name, and others are very different. For example, Canvas’s Calendar is a huge improvement over D2L’s and will be a very useful way for instructors to communicate due dates and other events with students.
Because it can be handy to view the features side-by-side, iDocs has put together a table illustrating the differences between the two learning management systems. Take a look, and as always contact your instructional designer with questions.