
existieren
to exist
To be present, to be real, or to live.
Glaubst du, dass Außerirdische auf anderen Planeten existieren?
Do you believe that aliens exist on other planets?
to exist
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to exist
To be present, to be real, or to live.
Glaubst du, dass Außerirdische auf anderen Planeten existieren?
Do you believe that aliens exist on other planets?

to subsist
To survive under difficult conditions or just barely get by.
Nach dem Verlust seines Jobs konnte er von seinen Ersparnissen nur noch mühsam existieren.
After losing his job, he could only subsist with difficulty on his savings.
'Existieren' (to exist) ends in '-ieren', which is typical for verbs from other languages (often Latin). These verbs are always regular and form their past participle without 'ge-' ('existiert').
Dieses Problem hat schon immer existiert.
This problem has always existed.
In its main meaning, 'existieren' (to exist) is often used in philosophical, scientific, or abstract contexts to describe the mere existence of something.
Die Frage, ob Paralleluniversen existieren, beschäftigt viele Physiker.
The question of whether parallel universes exist occupies many physicists.
You can recognize the meaning 'überleben' (to survive) from additional words that describe a difficulty. Pay attention to adverbs like 'kaum' (hardly), 'mühsam' (with difficulty), or the preposition 'von' (on/from), which indicates what someone lives on.
Mit so wenig Geld kann man kaum existieren.
With so little money, one can hardly subsist.
to live
Leben and existieren can both express that someone has to manage with certain means. Leben is the neutral choice. Existieren sounds more formal and often emphasizes that the means are scarce and just sufficient for survival.

Er muss von nur 900 Euro im Monat existieren.
He has to subsist on only 900 euros a month.
Er lebt von 900 Euro im Monat.
He lives on 900 euros a month.