You can discover an invention and invent a discovery. You cannot discover something inexistent but you can invent even impossible things.
I believe that the underlying neural processes that give rise to discoveries and inventions are the same. However, (not to be taken too seriously) here are a couple of rules of thumb:-
Discoveries do not add to what was there already, inventions do.
Discoveries make the world more simple inventions make the world more complicated.
Discovery is finding something that is already existing (e.g. discovery of new planets, finding water on Mars etc.)
Invention is finding something new (e.g. Invention of Pen, TV or any gadgets etc.)
I will take as starting point the definition of invention from a legal perspective(though I am no lawyer. My disclaimer :-). In the US law (a different definition may apply in other countries but because of WIPO I would believe an alternate definition will not vary that much) an invention is defined as :
" any art or process (way of doing or making things), machine, manufacture, design, or composition of matter, or any new and useful improvement thereof, or any variety of plant, which is or may be patentable under the patent laws of the United States.".
A discovery on the other hand is more broader, you can discover an algorithm, a mathematical formula, a physical law of nature, a biological process, etc. These are not inventions but are natural phenomena that is discoverable. An invention is also a discovery, and if you want to subcategorize it, then you can call it an invention. A mathematical algorithm or natural law cannot be an invention as per the legal definition given
Hope this helps
when a thing is already exist and anyone work on them and reveal it called discovery and when a thing actually not exist and anyone creat or make them called invention
Invention is the mother of necessity and Discovery is pastime.
P.S.
Discovery is finding out or figuring out something that preexists, while invention is using objects that preexist to create something new that is first of its kind.
Invention is 1% inspiration and 99% perspiration (Edison). Discovery is an accident or 1% perspiration and 99% inspiration.
Please, look at this paper: http://www.informationphilosopher.com/solutions/scientists/mach/accident_in_invention_and_discovery.html. The achievement of the discoverer consists in his sharpened attention, which detects the uncommon features of an occurrence and their determining conditions from their most evanescent marks, submitting them to exact and full observation. More is required for the development of inventions: more extensive chains of images are necessary here, the excitation by mutual contact of widely different trains of ideas, a more powerful, more manifold, and richer connections of the contents of memory, a more powerful and impressionable psychical life. Hope it helps.
Discovery is identifying something already exists that no one has found yet.
an invention is something completely new with own ideas.
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