herein
in / come in
Expresses movement from outside to inside. It is often used on its own as an invitation to enter.
Als es klopfte, rief er laut: „Herein!“
When there was a knock, he called loudly, 'Come in!'

in / come in
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in / come in
Expresses movement from outside to inside. It is often used on its own as an invitation to enter.
Als es klopfte, rief er laut: „Herein!“
When there was a knock, he called loudly, 'Come in!'

The word consists of 'her' and 'ein'. The syllable 'her' signals movement toward the speaker. 'Herein' therefore means 'into the room where I am'.
Komm bitte herein und schließ die Tür.
Please come in and close the door.
'Herein' often functions as a separable prefix for verbs that describe movement. Examples include 'hereinkommen' (to come in), 'hereinbitten' (to invite in), 'hereinlassen' (to let in), or 'hereinschauen' (to look in / drop by).
Der Schneesturm war so stark, dass Schnee zur Tür hereinkam.
The snowstorm was so strong that snow came in through the door.
In spoken language, 'herein' is almost always shortened to 'rein'. 'Komm rein!' (Come in!) is much more common and natural than 'Komm herein!'
Es regnet! Kommt schnell rein!
It's raining! Come in quickly!
out
'raus' and 'herein' both describe movement across a boundary, for example at a door, but in opposite directions. 'raus' means from inside to outside and is colloquial. 'herein' means from outside to inside, often toward the person who is already inside. You also hear 'Herein!' (Come in!) as an invitation when someone knocks. Learners may confuse the words because both have to do with entering or leaving a room. The important point is: 'raus' leaves the room; 'herein' comes into the room.

Nach dem Klopfen sagt der Verkäufer freundlich: „Herein!“
After the knock, the salesperson says kindly, “Come in!”
Vor dem Termin geht Tom noch kurz raus, um zu telefonieren.
Before the appointment, Tom goes out briefly to make a phone call.