What is a drum in a laser printer?

"margin-bottom:0px;color:rgb(51,51,51);font-family:'Helvetica Neue', Arial, sans-serif;font-size:16px;font-style:normal;font-weight:normal;">

The printing process takes place when the photo-sensitive roller of

the drum unit attracts the toner. From here the toner transfers to

the paper and with some heat it binds over the paper. Over the

time, the drum unit becomes dirty with the passage of time due to

the accumulated dirt and dust over it. Replacement is the only

choice as the drum unit is also a consumable part of the printer

and over the time, it should be replaced with a new one to maintain

the optimal print quality. Most of the advanced printers give a

warning when it is the time to change the drum unit.