Polling can be used to assess previous knowledge, check for understanding, start a discussion, ask a question where students would be more comfortable responding anonymously (in lieu of raising hands), or for many other tasks. The following three polling tools can all be embedded into a Libguide.
Libguide polls:
Poll Everywhere (free 30 day trial, cost after):
What tool that we talked about today do you think you're most likely to use in your instruction?