A full set of eyelash extensions means the extensions are placed throughout the entire eye.
(These are semi-permanent extensions)
A partial set of eyelash extensions means ONLY the outside corners of the eye. Why just the outside corners? To give the “cat-eye” effect 😉
(These are temporary lashes-clusters)
Both full and partial sets can be achieved with strip lashes*, clusters and semi-permanent extensions.
*strip lashes-some manufacturers make partial strip lashes. If not available, you may use a full strip and cut only the portion needed BEFORE applying to the eye.
Where your Journey into the Beauty Industry begins! 
Nice blog! I’ve just had clusters put on 1 week now, and really like the look it gives, would definitely do it again. They do advise a patch test, which I did. The salon I used is in London, called Blink Brow Bar. They explain all that is necessary, so you can make an informed decision.