because of
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because of
Indicates the reason or cause for something. In standard German it is used with the genitive, and in colloquial speech often with the dative.
Wegen des starken Regens bleiben wir heute zu Hause.
Because of the heavy rain, we're staying home today.
In standard German, 'wegen' (because of) is used with the genitive. In spoken language and informal contexts, however, use with the dative is very common and is often accepted.
Wegen des schlechten Wetters wurde das Spiel abgesagt.
Because of the bad weather, the game was canceled.
Normally, 'wegen' (because of) comes before the noun. In more formal or written contexts, however, it can also be placed after the noun, in which case the genitive is obligatory.
Des Regens wegen sind wir zu Hause geblieben.
Because of the rain, we stayed at home.
To ask about a reason expressed with 'wegen' (because of), you can use the question word 'Weswegen?' (For what reason?). It is somewhat more formal than 'Warum?' (Why?).
Weswegen kommst du heute später zur Arbeit?
For what reason are you coming to work later today?
because
'weil' and 'wegen' both give a reason. The most important difference is the grammar. 'weil' is a conjunction and introduces a subordinate clause with a verb: you say what happens or happened. 'wegen' is a preposition and comes before a noun or pronoun, for example 'wegen des Regens' (because of the rain) or, colloquially, 'wegen dem Regen'. Learners confuse these words because both answer the question 'Why?'. If you need a whole clause with a verb, use 'weil'. If you are only naming a thing or a reason as a noun, 'wegen' fits.
Samir ist wegen des starken Windes nicht in den Wald gegangen.
Samir didn't go into the forest because of the strong wind.
In der Schule konnte meine Kollegin die App nicht öffnen, weil das WLAN ausgefallen ist.
At school, my colleague couldn't open the app because the Wi-Fi had gone down.