geschlossen
closed
Not open; the opposite of open. Refers to doors, windows, shops, or institutions.
Das Museum ist montags immer geschlossen.
The museum is always closed on Mondays.

closed
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closed
Not open; the opposite of open. Refers to doors, windows, shops, or institutions.
Das Museum ist montags immer geschlossen.
The museum is always closed on Mondays.

'Geschlossen' is the past participle of the verb 'schließen' (to close). This origin explains the basic meaning 'not open' and helps you understand the figurative meanings such as 'unified' or 'complete in itself'.
Bitte halten Sie die Tür stets geschlossen.
Please keep the door closed at all times.
In its most common meaning, 'geschlossen' is used for places such as shops, banks, public offices, or museums. The reason is often given with 'wegen' (because of), e.g. 'wegen Feiertag geschlossen' (closed because of a public holiday).
Die Bibliothek bleibt wegen Renovierungsarbeiten nächste Woche geschlossen.
The library will remain closed next week due to renovation work.
When 'geschlossen' is used in connection with a group of people such as a team, a party, or a sports team, it means 'unified' or 'unanimous'.
Die Mannschaft zeigte eine geschlossene Leistung und gewann das Spiel.
The team showed a united performance and won the game.
In connection with surfaces such as 'Schneedecke' (blanket of snow), 'Wolkendecke' (cloud cover), or 'Eisdecke' (ice cover), 'geschlossen' means something like 'continuous' or 'unbroken'.
Wegen der geschlossenen Wolkendecke war die Sonne den ganzen Tag nicht zu sehen.
Because of the continuous cloud cover, the sun was not visible all day.
The expression 'geschlossene Gesellschaft' (private event) is a fixed expression. It refers to a private event that is not open to the public and is often seen on signs outside restaurants.
Die Feier findet als geschlossene Gesellschaft statt, nur geladene Gäste haben Zutritt.
The celebration is being held as a private event; only invited guests have access.
In an abstract, intellectual sense, 'geschlossen' describes something that is logical and complete. It is often combined with 'in sich': 'ein in sich geschlossenes System' (a self-contained system) or 'eine in sich geschlossene Argumentation' (a self-contained argument).
Der Philosoph entwickelte ein in sich geschlossenes Gedankensystem.
The philosopher developed a self-contained system of thought.
to / too / closed
'zu' and 'geschlossen' can both mean that something is not open. 'zu' is short and very common in everyday language, especially for doors, windows, bags, or eyes. 'geschlossen' is more precise and a bit more neutral; it is also often used for shops, offices, or institutions. In many simple situations, both work similarly: 'Die Tür ist zu' (the door is closed), 'die Tür ist geschlossen' (the door is closed). But 'geschlossen' sounds more complete, especially when you want to say officially that something is not open.

Die Apotheke ist am Sonntag geschlossen.
The pharmacy is closed on Sundays.
Ist das Fenster im Bad schon zu?
Is the bathroom window already closed?