fließen
to flow
The movement of liquids or gases in a particular direction, like water in a river.
Der Rhein fließt durch Deutschland in die Nordsee.
The Rhine flows through Germany into the North Sea.

to flow
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to flow
The movement of liquids or gases in a particular direction, like water in a river.
Der Rhein fließt durch Deutschland in die Nordsee.
The Rhine flows through Germany into the North Sea.

'Fließen' (to flow) describes movement and therefore always forms the perfect tense with the auxiliary verb 'sein' (to be). A common mistake is using 'haben' (to have).
Das Wasser ist langsam den Berg hinabgeflossen.
The water flowed slowly down the mountain.
'Fließen' (to flow) belongs to a word family around water and movement. Related words are 'der Fluss' (the river), 'die Flüssigkeit' (the liquid), and the adjective 'flüssig' (liquid/fluent).
Der Fluss fließt durch die Stadt.
The river flows through the city.
The verb is often combined with prepositions that indicate direction. Common patterns are 'fließen in (+ accusative)' (to flow into), 'fließen durch (+ accusative)' (to flow through), and 'fließen aus (+ dative)' (to flow out of).
Das Geld fließt auf ein separates Konto.
The money flows into a separate account.
The concept of flowing is often transferred to abstract things. Typical combinations are 'Geld fließt' (money flows), 'Informationen fließen' (information flows), or 'Daten fließen' (data flows).
Die Informationen fließen direkt vom Management an die Mitarbeiter.
The information flows directly from management to the employees.
To describe that traffic is moving, the phrase 'der Verkehr fließt' (traffic flows) is used. It is often combined with adverbs such as 'gut' (well), 'langsam' (slowly), or 'reibungslos' (smoothly).
Am Sonntagmorgen fließt der Verkehr auf der Autobahn meistens gut.
On Sunday mornings, traffic on the highway usually flows well.
to stand
'stehen' and 'fließen' form a clear contrast with liquids. 'fließen' means that water or another liquid moves in one direction. 'stehen' in this context means that the liquid does not move and stays in one place. For example, you say that water 'steht' in a bucket, but a stream 'fließt'. So the difference is: no movement with 'stehen', movement with 'fließen'.

Im Frühling fließt der kleine Bach wieder schneller.
In spring, the small stream flows faster again.
Nach dem Regen steht Wasser auf dem Weg vor dem Haus.
After the rain, there is water standing on the path in front of the house.