daher
therefore
Introduces a logical result or consequence; for this reason, therefore.
Ich habe den Zug verpasst und kam daher zu spät zur Arbeit.
I missed the train and therefore arrived late to work.

therefore / from there
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therefore
Introduces a logical result or consequence; for this reason, therefore.
Ich habe den Zug verpasst und kam daher zu spät zur Arbeit.
I missed the train and therefore arrived late to work.

'Daher' is made up of 'da' (there, then) and 'her' (from a direction). Literally, it means 'from there'. This origin explains both meanings: the logical consequence ('for this reason') and the spatial origin ('from this direction').
Es war ein Feiertag, daher waren die Geschäfte geschlossen.
It was a public holiday; therefore, the shops were closed.
When 'daher' (therefore) stands at the beginning of a sentence, it introduces a consequence and requires inversion: the verb comes directly after 'daher' in position 2. It can also come after the verb and subject.
Das Wetter war schlecht. Daher blieben wir zu Hause.
The weather was bad. Therefore, we stayed at home.
In the meaning of 'deshalb' (therefore/that’s why), 'daher' belongs more to written or more formal language. It structures arguments and explains logical connections.
Die Nachfrage ist stark gestiegen, daher müssen wir die Produktion erhöhen.
Demand has risen sharply; therefore, we must increase production.
The spatial meaning 'von dort' (from there) is rare today and is mainly used in literary or poetic texts. It is often combined with a verb of movement.
Aus dem Tal stieg Nebel daher.
Mist rose from the valley.
so / therefore
'also' and 'daher' can both express a result that follows from a reason. 'also' is very common in conversation and often sounds like a direct conclusion. 'daher' also means 'for this reason' or 'therefore', but it sounds a bit more factual and works well in explanations, reports, or more formal texts. Learners may confuse the words because both introduce a consequence. In everyday speech, 'also' often sounds more natural; in a written or factual context, 'daher' can sound more precise and calm.

Heute ist das Geschäft geschlossen, daher kauft meine Nachbarin morgen ein.
The shop is closed today, so my neighbor will do her shopping tomorrow.
Nach dem Essen ist Emil müde, also geht er früh ins Bett.
After dinner, Emil is tired, so he goes to bed early.