die Serie
series
A television or video production that consists of several parts (episodes or seasons) and tells an ongoing story.
Welche Serie schaust du im Moment am liebsten?
Which series are you enjoying watching the most at the moment?

series
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series
A television or video production that consists of several parts (episodes or seasons) and tells an ongoing story.
Welche Serie schaust du im Moment am liebsten?
Which series are you enjoying watching the most at the moment?

In the context of television, it is important to know the hierarchy: A 'Serie' (series) consists of several 'Staffeln' (seasons). Each 'Staffel' (season) consists of several 'Folgen' (episodes).
Diese Serie hat drei Staffeln mit je zehn Folgen.
This series has three seasons with ten episodes each.
When 'Serie' (series) describes a sequence of events, it is often followed by the preposition 'von' and a plural noun. Typical combinations are 'eine Serie von Unfällen' (a series of accidents) or 'eine Serie von Erfolgen' (a series of successes).
Die Mannschaft feierte eine beeindruckende Serie von Siegen.
The team celebrated an impressive series of victories.
In connection with industrial production, 'Serie' (series) is used in fixed expressions. 'In Serie gehen' means that the mass production of a product begins.
Das neue Automodell soll im Herbst in Serie gehen.
The new car model is scheduled to go into series production in the fall.
consequence / episode
'die Folge' and 'die Serie' can both mean something that consists of several parts or is in a sequence. With films, podcasts, or audio dramas, however, a 'Folge' is only one individual part. The 'Serie' is the whole thing with many episodes. The words can be confused because you are talking about the same TV show. As a practical rule: You watch an episode, but you watch a series. In a more general sense, 'Serie' can also mean several similar events, while 'Folge' tends to emphasize the ordered sequence of individual elements.

Am Wochenende hat Lena eine spannende Serie angefangen.
Lena started an exciting series at the weekend.
Heute Abend sehe ich die neue Folge meiner Lieblingsserie.
Tonight I’m watching the new episode of my favorite series.