Fernsehen vs. Fernseher
The German words Fernsehen and Fernseher both relate to the concept of television or TV but differ in meaning and usage. Understanding their distinctions makes it easier to use them correctly.
Fernsehen
A1Fernsehen refers to the activity or concept of watching television or TV as a medium (similar to television as a system or broadcasting medium in English). It is a noun, and it is neutral in gender (das Fernsehen).
Ich schaue abends gerne Fernsehen.
(I like watching TV in the evenings.)
Fernsehen ist heutzutage sehr populär.
(Watching television is very popular these days.)
Das heutige Fernsehen bietet eine Vielzahl von Programmen.
(Today's television offers a variety of programs.)
Fernseher
A1Fernseher refers specifically to the physical television set or device used to watch programs. It is a masculine noun (der Fernseher).
Ich habe einen neuen Fernseher gekauft.
(I bought a new television.)
Der Fernseher steht im Wohnzimmer.
(The television is in the living room.)
Könntest du bitte den Fernseher einschalten?
(Could you please turn on the television?)
Summary
In summary, Fernsehen refers to the activity or medium of watching television, whereas Fernseher describes the physical television set. Using these two terms correctly depends on whether you are discussing the medium or the device.