
hintereinander
one behind another
Describes a spatial arrangement in which things or people are positioned one after another in a line.
Die Kinder stellten sich hintereinander in einer Reihe auf.
The children lined up one behind another in a row.
one after another / in a row
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one behind another
Describes a spatial arrangement in which things or people are positioned one after another in a line.
Die Kinder stellten sich hintereinander in einer Reihe auf.
The children lined up one behind another in a row.

one after another
Describes a temporal sequence of events or actions that follow directly after one another, often without interruption.
Er hat drei Tassen Kaffee hintereinander getrunken.
He drank three cups of coffee one after another.

in a row
Refers to a series of identical or similar occurrences; consecutively or in succession.
Unsere Mannschaft hat fünfmal hintereinander gewonnen.
Our team has won five times in a row.
This adverb is a compound of 'hinter' (behind), 'ein' (one), and 'ander' (other). So it literally means 'behind one another' and describes an order or sequence.
Die Entenküken watschelten hintereinander über die Wiese.
The ducklings waddled one behind another across the meadow.
'Hintereinander' is an adverb and is not declined, so its form always stays the same. It usually appears in the middle field of the sentence, often after the conjugated verb and the subject.
Wir haben uns die neuen Folgen der Serie alle hintereinander angesehen.
We watched all the new episodes of the series one after another.
When 'hintereinander' is used together with a number or a word like 'mehrmals' (several times), it means 'in a row' or 'consecutively.' Watch for phrases like 'dreimal hintereinander' (three times in a row).
Er hat die Prüfung zweimal hintereinander nicht bestanden.
He failed the exam twice in a row.
You can often recognize the spatial meaning from verbs of position or movement. Typical verbs are 'stehen' (to stand), 'sitzen' (to sit), 'gehen' (to walk/go), or 'fahren' (to drive/travel).
Im Stau standen die Autos kilometerlang hintereinander.
In the traffic jam, the cars stood one behind another for kilometers.
one after another
Both words describe events or actions occurring in sequence. “Nacheinander” is neutral and simply means one after another, while “hintereinander” often places greater emphasis on a direct sequence without a break. Use “hintereinander” when this immediate succession is important.

Nach der Pause traten die drei Redner hintereinander ohne Unterbrechung auf.
After the break, the three speakers appeared one after another without interruption.
Nach der Pause traten die drei Redner nacheinander in der geplanten Reihenfolge auf.
After the break, the three speakers appeared one after another in the planned order.