De brief wordt geschreven.
English: The letter is being written.
The 'lijdende vorm' in Dutch is the passive voice. It is used when the focus is on the action or the object, not on who is doing the action.
Use the passive voice in Dutch when the person doing the action is unknown, unimportant, or obvious. It is common in news reports, instructions, and formal writing.
De brief wordt geschreven.
English: The letter is being written.
Het huis is verkocht.
English: The house has been sold.
De appels worden gegeten.
English: The apples are being eaten.
De auto werd gerepareerd.
English: The car was repaired.