What is "Heresy"?

What exactly is "heresy" according to the Bible?

What is heresy?

What do Bible-believing Christians mean when they say a doctrine or teaching is “heresy”?

And what exactly is the difference between “heresy” versus “error”?

How can these terms be truthfully or accurately defined?

What is the only possible standard that can be referenced when discussing these notions?

An introductory discussion by Pastor Tim Hunt that pin-points exactly what the differences are between doctrines considered to be “erroneous” as opposed to ones that are “heretical".