All terms
Price zones where buyers or sellers have repeatedly stepped in.
Support is a zone where buying has previously been strong enough to stop a decline. Resistance is where selling has stopped an advance. Both are areas rather than exact lines.
They work partly because many traders watch the same levels, which makes them somewhat self fulfilling. When a level breaks, it often reverses role.
Old resistance that price closes decisively above frequently becomes support on the retest.
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