Iframe Tag just adds another window on your Webpage and due to which whenever a browser loads a page with an iframe it loads the original Page and Iframe as a separate 2 different pages. So in some cases Iframe is not-supported and thus, displays an Error.
Sigma is a Greek letter that corresponds somewhat to our letter S and thus sigma is often used to stand for some concept that starts with S. There is an upper case (capital) sigma and a lower case (small) sigma. They are and. is most ofter used to indicate a sum.
Six Sigma is a process improvement method that focuses on product quality. A successful Six Sigma process has no more than 3.4 defects for every million items produced. A defect includes anything that does not satisfy customer specifications. Let's meet Ms. Steep, the owner of the Terrific Teapot Company.