transparent
Physically see-through, so that you can see through it.
Durch das transparente Glas der Vase kann man die Stiele der Blumen sehen.
Through the transparent glass of the vase, you can see the stems of the flowers.

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Physically see-through, so that you can see through it.
Durch das transparente Glas der Vase kann man die Stiele der Blumen sehen.
Through the transparent glass of the vase, you can see the stems of the flowers.

The word comes from Latin. The prefix 'trans-' means 'through', and the second part derives from 'parere' (to appear, to show oneself). So 'transparent' literally means 'shining through'.
Die transparente Schicht schützt das Display des Telefons.
The transparent layer protects the phone's display.
The context makes the meaning clear. If it is about materials like glass or film, 'transparent' means physically see-through. If it is about information, politics, or finances, the figurative meaning 'nachvollziehbar' (traceable/understandable) or 'offen' (open) is meant.
Die Verpackung ist transparent, damit man das Produkt sieht.
The packaging is transparent so that you can see the product.
In its literal meaning, 'transparent' is often combined with materials that you can see through. Typical examples are 'transparentes Glas' (transparent glass), 'transparente Folie' (transparent film), or 'transparenter Kunststoff' (transparent plastic).
Legen Sie eine transparente Folie über die Schüssel.
Place a transparent film over the bowl.
In the figurative sense, 'transparent' is frequently used with abstract nouns from politics and business. Common combinations are 'transparente Prozesse' (transparent processes), 'transparente Kommunikation' (transparent communication), and 'transparente Kosten' (transparent costs).
Die Wähler fordern eine transparente Regierung.
The voters are demanding a transparent government.
clear
'klar' and 'transparent' can both mean that you can see through something. In this physical sense, 'klar' sounds very natural with water, glass, or air, while 'transparent' sounds a bit more precise or factual. Both words can also mean figuratively that something is easy to follow or understand. In that case, 'transparent' is used especially often for decisions, rules, or processes where nothing is meant to remain hidden. Learners may confuse the words because both can mean 'understandable' or 'see-through'. 'klar' is more general and more useful in everyday language; 'transparent' is more appropriate when the focus is on openness and traceability.

Für die Familie macht Anna die Kosten der Reise transparent.
Anna makes the travel costs transparent for the family.
Im Kurs ist die Regel für die Prüfung jetzt klar.
In the course, the rule for the exam is now clear.