Use can be used as uncountable noun; meaning,the action or fact of using something, as:</SPAN>
an exit for use in emergencies,the increasing use of computers in education
Use can be used as countable noun; meaning, a purpose for which something can be used, as</SPAN>:
Robots have many different uses in modern industry
Usage is also a (C/U)noun having specific meaning:
(C)the way a particular word in a language, or a language in general, is used, as:
a guide to common English usage, a book on modern English usage
(U)It can be also used to express the way in which something is treated or used.
Water usage is increasing.
This equipment is designed to withstand rough usage.
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