what kind of spider is black and..

Brief：
what kind of spider is black and yellow, pretty big..has a stitching in th e center of web ..we call them banana spiders but what really is it and is .. 

what kind of spider is black and yellow, pretty big..has a stitching in th e center of web ..we call them banana spiders but what really is it and is it dangerous..i was told they jump..i live in louisiana and see them alot including today

If i am correct it is called a Garden Spider(Argiope)which i most certainly think i am sure that it is a garden spider. Garden spiders are not dangersous theBlack and Yellow Garden Spiders are harmless to humans. Because they are large, many people fear them; however, not only are they harmless, but they do a lot of good. These spiders eat large amounts of insect pests, such as flies, mosquitoes, and aphidsy actually do alot of good.

However i do not think they jump. Jumping spiders, all of which are in the family Salticidae, are among the most interesting spider groups to watch. Jumping spiders come in many sizes and color patterns. Active hunters during the day, they have good eyesight, relying primarily on movement to locate prey. They stalk their prey before attacking in a fast leap. Jumping spiders put out a line of webbing when they jump and can sometimes be seen dangling from this silken dragline after a leap that fails.

Many jumping spiders are bold, stocky and often brightly colored. They often have conspicuous bands of black and white on their bodies or legs. Others have velvety red abdomens and some even have metallic colors on the chelicerae. Jumping spiders have eight eyes, with one large pair in the front. Like most spiders, jumping spiders are not considered hazardous to humans and are unlikely to bite unless cornered or handled.