verdecken
to cover
To place, put, or hold something over or in front of another thing so that it is no longer visible.
Eine große Wolke verdeckte die Sonne.
A large cloud covered the sun.

to cover / to conceal
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to cover
To place, put, or hold something over or in front of another thing so that it is no longer visible.
Eine große Wolke verdeckte die Sonne.
A large cloud covered the sun.

'Verdecken' (to cover / to conceal) is an inseparable verb. The prefix 'ver-' always remains attached to the stem 'decken' (to cover), regardless of tense or sentence position.
Er verdeckte sein Gesicht mit den Händen.
He covered his face with his hands.
Whether 'verdecken' (to cover / to conceal) is meant literally or figuratively can be recognized from the object. With concrete objects like 'Gesicht' (face) or 'Sonne' (sun), it is literal. With abstract things like 'Gefühle' (feelings) or 'Absichten' (intentions), it is figurative.
Der Vorhang verdeckt das Fenster nur halb.
The curtain only half covers the window.
In the figurative meaning, 'verdecken' (to conceal) is often used with abstract nouns. Typical combinations are 'seine Absichten verdecken' (to conceal one's intentions), 'die Wahrheit verdecken' (to conceal the truth), or 'seine Spuren verdecken' (to cover one's tracks).
Der Politiker versuchte, den wahren Grund für seine Entscheidung zu verdecken.
The politician tried to conceal the real reason for his decision.
The past participle 'verdeckt' is often used as an adjective or adverb. It means 'secret' or 'not openly visible', not only with cards but also in investigations.
Der Detektiv führte eine verdeckte Ermittlung durch.
The detective carried out an undercover investigation.
to hide
'verstecken' and 'verdecken' both have to do with something not being visible or known. 'verstecken' means that you put something, or yourself, in a place where others cannot easily find it. So it is often about searching and finding. 'verdecken' means that something is in front of or over something else, so that you cannot see it. It can also mean that you do not show feelings, intentions, or facts. Learners may confuse the words because both have to do with 'not visible'. Memory tip: You hide something in a place with 'verstecken', but you cover something with or by means of something else with 'verdecken'.

Der große Rucksack verdeckt im Zug den freien Sitz neben der Tür.
On the train, the large backpack covers the empty seat next to the door.
Greta versteckt den Schlüssel unter dem Blumentopf.
Greta hides the key under the flowerpot.