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Could be a Black and Yellow garden spider, common the US west coast.
The spider you are referring to is likely the black widow spider. The female black widow has a distinct red hourglass shape or white crescent on its abdomen. They are known for their venomous bite, so caution should be taken when encountering them.
The spider you are describing is likely the black widow spider. Black widows are known for their shiny black bodies with a distinctive red hourglass shape on their underside. They can be found in Arizona and are known for their venomous bite.
The spider you are describing is mainly found in Australia. Its called a red back. Very Very Poisonous.
a wolf spider. they hurt but are not deadly to humans
The spider you are describing is likely the black widow spider. It is known for its shiny black body with a red hourglass-shaped marking on its abdomen. This spider is venomous and can be found in various parts of the world.
red back spider
black widow
A RED BACK!!! bY THE WAY I WOULDN'T TOUCH IT!! THEY ARE REALLY DEADLY, ESPECIALLY THE BABY ONES!!! ^ i wouldn't pay attention to that If the red is on the belly then worry more, it the red is on the back its not a black widow, ive seen a bunch of spiders with a black body and white stripe, they are jumping spiders, the red button i don't know much about.
Arachnic
It can be hard to tell what kind of a spider you are looking at that has a red head and back and black and white striped legs, since the body type is also an important factor. Chances are that it is a red-headed jumping spider, which can cause a somewhat painful bite but is not otherwise dangerous to humans.