
während
while
As a conjunction connecting two actions or events that take place at the same time.
Während er kochte, hörte er Musik.
While he was cooking, he listened to music.
during / while
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while
As a conjunction connecting two actions or events that take place at the same time.
Während er kochte, hörte er Musik.
While he was cooking, he listened to music.

during
As a preposition indicating a period of time in which something happens; in the course of.
Während des gesamten Films hat niemand gesprochen.
No one spoke during the entire film.

whereas
As a conjunction expressing a contrast or contradiction; whereas.
Anna ist sehr gesprächig, während ihre Schwester eher schüchtern ist.
Anna is very talkative, whereas her sister is rather shy.
'Während' (during/while) can be a preposition that comes before a noun, or a conjunction that introduces a subordinate clause. As a conjunction, 'während' sends the verb to the end of the clause.
Während des Konzerts hat es geregnet.
It rained during the concert.
As a preposition, 'während' (during) takes the genitive in standard German. In colloquial speech, however, the dative is used very frequently; you often hear it, but you should avoid it in formal texts.
Während seiner Rede schliefen einige Zuhörer ein.
During his speech, some listeners fell asleep.
As a conjunction, 'während' (while/whereas) can express simultaneity or a contrast. Which meaning is intended can only be understood from the content of the two parts of the sentence.
Während sie die Zeitung liest, trinkt er Kaffee.
While she reads the newspaper, he drinks coffee.
if / when
Both words can connect two actions in time. „Wenn“ frames a point in time or a repeated situation, while „während“ emphasizes simultaneous duration and parallel progress. Use „wenn“ when one action provides the occasion, and „während“ when both processes take place in parallel.

Während ich nach Hause gehe, telefoniert mein Bruder mit mir.
While I'm walking home, my brother talks to me on the phone.
Wenn ich nach Hause komme, klingelt mein Bruder oft an der Tür.
When I get home, my brother often rings the doorbell.