What's the difference between stainless steel pipe fittings and stainless steel pipes?

Stainless steel pipe is a pipe and a strip, but in practical application, we need to connect the strip pipe with some accessories, so these accessories are called stainless steel pipe fittings, for example:

Stainless steel PE anticorrosive plastic-coated hot water pipe

Stainless steel PE plastic-coated hot water pipes are widely used in hospitals, hotels, residential quarters, office buildings, schools and so on. We call it pipes, but we need to connect these pipes. At this point, we need the following fittings:

Stainless steel inner steel wire hinged 90 elbow

Stainless steel inner wire hinged 90-degree elbow is what we call pipe fitting, which is mainly used to connect pipes. If it is a pipe fitting, it should also be noted that it can be connected in a variety of ways, such as double-card connection, groove, socket welding, ring pressure and so on.