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Theory:

Some of the uses of magnets in various fields are listed below.
 
1. Industry:
  • Magnetic conveyor belts are used in industries to separate magnetic materials from scraps or junks mixed with non-magnetic materials.
Magnetic_separator_of_a_conveyor_belt_at_lafarge.jpg
Magnetic conveyor belt
  • Magnets are so strong that it is used to lift heavy loads. In a junkyard, a crane attached to a magnet is used to carry heavy metal loads. It also helps to separate magnetic materials from the junk.
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Junkyard crane
 
2. Computers:
  • In machines, magnets are used in computer storage devices such as hard discs.
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Computer storage device
  • The magnets help the computers in banks to read the MICR numbers written on a cheque.
  • Magstripe is a magnetic strip found on the back of a credit or debit card. This magstripe is a thin plastic film made up of tiny iron-based magnetic particles. Each particle that measures about \(20\ millionths\ of\ an\ inch\) in length is a very small bar magnet.
UBL_Wiz_Visa.jpg
Magstripe
 
3. Medical field:
Magnetic Resonance Imaging, also known as MRI, is a method used in hospitals to scan a particular internal organ in our body. These MRI machines make use of a powerful electromagnet for scanning.
 
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MRI scan
 
4. Other uses:
  • The screw drivers' tips are mildly magnetic to hold the screws to the tip.
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Magnetic screw driver
  • Even children's play toys and dolls have magnets in them.
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Magnetic toys
  • The other simple things which use magnets are bags, pencil boxes, stickers on refrigerators, pin holders, and phone covers.
BeFunky-collage (3).jpg
From clockwise direction: Small magnets in bag, stickers on refrigerator, pin holders, and phone covers.
Reference:
https://upload.wikimedia.org/wikipedia/commons/9/9a/Automatic_door_lock_system_846.jpg
https://upload.wikimedia.org/wikipedia/commons/f/f4/DC_Motor.jpg
https://live.staticflickr.com/1263/1401210289_4c0f08e1b9_b.jpg
https://upload.wikimedia.org/wikipedia/commons/6/62/Mobile_phone_case.jpg
https://upload.wikimedia.org/wikipedia/commons/2/24/Magnetic_separator_of_a_conveyor_belt_at_lafarge.jpg
https://upload.wikimedia.org/wikipedia/commons/0/0c/UBL_Wiz_Visa.jpg
https://live.staticflickr.com/1506/24290532856_004b730713_b.jpg
https://snappygoat.com/b/8c68c807dd1aa74af40decb4db59f7638a50f3a0