how does a transmiter works

i sont get it ow do transmiter send radio waves

Radio waves are produced when the
electric field rapidly changes: there has
to be an alternating current.
An electric field spreads out into space.
When you change an electric field, the
distant parts of it do not change
instantly. The change is limited by the
speed of light. If you fluctuate the
electric field, you therefore create a
wave.
You can think of it as space being
permeated everywhere by an electric
field; your circuit just creates a
disturbance in it, like disturbing the
surface of water. The disturbance
travels away at the speed of light, like
ripples in a pond. If your circuit just has
steady DC flowing through it, the
disturbance occurs just when you switch
it on and when you switch it off.
(Indeed, electric equipment causes
interference when it turns on and off:
relays, switches, the commutation of
electric motor brushes, or anything that
generates sparks: all radiate and can
interfere with radio communication, or
with sensitive equipment.)
Radio-transmitting circuits are optimized
for radiating; they deliberately do things
that designers try avoid in circuits that
must minimize their radiation (which is
most circuits). Transmitters amplify
some high frequency AC, and energize
an antenna .