I frame is an HTML tag that allows you to add a separate window inside a web page = a page within a page <iframe src="http://yourdomain.com" width="100%" height="300"> <p>Your browser does not support iframes.</p> </iframe> Unfortunately many years ago people started using iframes as a way to introduce viruses, trojans etc. - and so they are not allowed to be used in lots of situations. Where they are allowed, people do all sorts of things - such as creating 1 pixel iframes - that you can't see but work in the background
Iframes are not search engine friendly. Search Engines cannot read iframed contends. Better avoid it.
iframe is page within a page. google does not recommend using iframes on pages, if you want to rank them well.
iframes are not harmful, unless it holds viruses or any potentially harmful codes. Don't worry about it.
i heard google dont like iframe, its confusing when i use iframe is that possible google won't give high rank to my site?