Canon EOS Rebel T5 18-55 IS II Kit - Manual (Page 59)

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Depending on the scene, position the subject toward the left or right to
create a balanced background and good perspective.
In the <A> mode, while you press the shutter button halfway to focus
on a still subject, the focus will be locked. You can then recompose the
shot and press the shutter button completely to take the picture. This is
called “focus lock”. Focus lock is also possible in other Basic Zone
modes (except <5>).
In the <A> mode, if the subject moves (distance to camera changes)
while or after you focus, AI Servo AF will take effect to focus on the
subject continuously. (The beeper will continue beeping softly.) As long
as you keep aiming the AF point on the subject while pressing the
shutter button halfway, the focusing will be continuous. When you want
to take the picture, press the shutter button completely.
A Full Auto Techniques (Scene Intelligent Auto)
Recomposing the Shot
Shooting a Moving Subject
COP
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