die Architektur
architecture
The art and science of designing, shaping, and constructing buildings.
Sie studiert Architektur an der Technischen Universität.
She studies architecture at the Technical University.

architecture
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architecture
The art and science of designing, shaping, and constructing buildings.
Sie studiert Architektur an der Technischen Universität.
She studies architecture at the Technical University.

In the context of IT, computers, or technology, 'Architektur' (architecture) does not refer to buildings, but to the structure and setup of a complex system.
Der Experte erklärte die Sicherheitsarchitektur des Netzwerks.
The expert explained the security architecture of the network.
To describe a building style, 'Architektur' (architecture) is often combined with an adjective, e.g. 'moderne Architektur' (modern architecture), or a noun in the genitive, e.g. 'die Architektur des Barock' (Baroque architecture).
Ich bewundere die klassische Architektur in Wien.
I admire the classical architecture in Vienna.
When 'Architektur' (architecture) refers to an academic subject or professional field, it is very often used with the verb 'studieren' (to study).
Mein Bruder hat schon immer davon geträumt, Architektur zu studieren.
My brother has always dreamed of studying architecture.
organization
'die Organisation' and 'die Architektur' can both describe the structure of a complex system. 'Organisation' generally means how parts are arranged and how something is structured internally. 'Architektur' is used especially for the basic technical or conceptual structure, for example in software or an IT system. The words can be confused because both talk about structure. 'Organisation' sounds broader and also fits work processes. 'Architektur' sounds more technical and describes the basic framework of a system.

Bei der neuen App erklärt Mehmet zuerst die Architektur des Systems.
For the new app, Mehmet first explains the architecture of the system.
Die Organisation der Abteilung ist klar, deshalb findet jeder schnell die richtige Ansprechperson.
The organization of the department is clear, so everyone quickly finds the right contact person.