Humans shared a common ancestor with chimpanzees about 5 to 7 million years ago. We don’t know exactly what this ancestor looked like but it probably walked on four legs like a chimp and had a smaller brain than we do. So both humans and modern chimpanzees evolved from the same, single, common ancestor.
The same, single species of ape that is the common ancestor of chimps, bonobos and humans is extinct now, though: it changed into us (and chimps and bonobos).
Ed and Sam are right. However, further along the tree it looks like the human lineage “split up” into several pre-human species that later re-combined. For example, some people argue that all humans today have a little bit of DNA from Neanderthals in us.
We do share a single common ancestor with chimps, and in fact if you go back far enough into the past, we share a single common ancestor with all life. The very first life on the planet.
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