
häufig
frequent
Recurring at short intervals or often; happening many times.
Er stellt während des Unterrichts häufig Fragen.
He frequently asks questions during class.
frequent
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frequent
Recurring at short intervals or often; happening many times.
Er stellt während des Unterrichts häufig Fragen.
He frequently asks questions during class.
The word 'häufig' (frequent/often) is related to 'der Haufen' (a large amount/pile). It describes that something occurs in large numbers or often, in other words 'haufenweise' (in heaps/lots).
Technische Probleme sind ein häufiger Grund für Verspätungen.
Technical problems are a frequent reason for delays.
As an adverb, 'häufig' (frequently/often) usually stands in the middle of the sentence, often after the conjugated verb and the subject. It describes how often an action takes place.
Wir gehen häufig im Park spazieren.
We often go for walks in the park.
The comparative forms 'häufiger' (more often) and 'am häufigsten' (most often) are often used as adverbs to compare frequencies. 'Am häufigsten' often stands in the middle of the sentence or at the beginning of the sentence for emphasis.
Seit er näher an der Arbeit wohnt, kommt er häufiger mit dem Fahrrad.
Since he has lived closer to work, he comes by bike more often.
often
Both oft and häufig indicate that something happens many times or at short intervals. Oft is used as an adverb, while häufig can also be placed directly before a noun. Use oft in a sentence about an action, and häufig when the word describes a noun more closely.

Ich bekomme häufigen Besuch von meiner Schwester.
My sister makes frequent visits.
Ich bekomme oft Besuch von meiner Schwester.
My sister often comes to visit me.