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.
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5
5
C
C
o
o
n
n
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r
r
o
o
l
l
l
l
e
e
r
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O
O
b
b
j
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c
c
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(
(
C
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)
I
I
n
n
f
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Controller Object and CO are synonyms (in Spring Boot where they refer to the same thing)
CO stands for Controller Object
Controller Class has methods (also known as Endpoints) for accepting HTTP Requests.
Spring Boot will instantiate single instance of this Class for us to use.
Back-end uses controller to receive requests from Front-end.