Insert
one
end
of
the
PCB
board
into
the
connector
card
slot,
use
the
connector
pin
as
the
outlet
of
the
pcb
board
to
connect
to
the
outside,
so
that
the
pad
or
copper
skin
contacts
the
pin
at
the
corresponding
position
to
achieve
the
purpose
of
conduction,
and
the
pcb
board
This
pad
or
copper
is
coated
with
gold
or
nickel-gold,
which
is
called
a
gold
finger
because
it
is
shaped
like
a
finger.
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