What you said, plus registered voters were polled, and not likely voters.
RVs - the lazy man’s pollsters.
Polls are over the place - some have Hillary up by double digits and some show her with a slight lead or tied.
You can trust none of them. Though the latter are likely closer to reality than the former.
Hillary is in deep trouble and July and the conventions are around the corner.
Just like Brexit, I estimate that there are 2-5% of undecideds who really are for Trump but afraid to admit it to a pollster.