The word “SCUBA” is an acronym for Self-Contained Underwater Breathing Apparatus. Scuba is a portable breathing device equipment worn by divers for breathing underwater which consist of one or two compressed-air tanks strapped to the back and connected by a hose to a mouthpiece.
Yes, anyone is allowed to dive as long as they do not have health issues, but there are limits to what non-swimmer can do. Non-swimmer are only allowed to make simple intro dives with an instructor and cannot get a full scuba license if cannot swim.
Yes, you can dive without being certified. You can join discover scuba diving programme which is specially designed for scuba diving first timer to dive without any prior experience. These programme is one of your first steps towards your journey into scuba diving.
You can enroll into scuba diver course which is a subset of the open water diver course to get scuba diving certification. To enroll in a scuba diver course, you must be 10 years old and above, need adequate swimming skills and in good physical health. You could get certified in just 3 - 4 days for the open water diver course but it depends on the dive centre.