This is the 7909th most frequent Swedish word.
video
A recording or broadcasting of moving visual images.
Here, 'video' is used as a noun to refer to a digital or physical recording of visual content.
Jag tittar på en video om galaxer.
I am watching a video about galaxies.
In this sentence, 'videon' is the definite form of the noun 'video', used to refer to a specific mentioned video.
Kan du skicka videon till mig?
Can you send the video to me?
Here, 'video' serves as an uncountable noun describing the general medium of visual recordings.