Org will recognize plain URL-like links and activate them as clickable links. The general link format, however, looks like this:
[[link][description]] or alternatively [[link]]
Once a link in the buffer is complete (all brackets present), Org will change the display so that ‘description’ is displayed instead of ‘[[link][description]]’ and ‘link’ is displayed instead of ‘[[link]]’. To edit the invisible ‘link’ part, use C-c C-l with the cursor on the link.