der Standard
standard
A generally recognized level of quality, a norm, or a rule that is considered normal or good.
Dieses Hotel bietet einen sehr hohen Standard an Service und Komfort.
This hotel offers a very high standard of service and comfort.

standard
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standard
A generally recognized level of quality, a norm, or a rule that is considered normal or good.
Dieses Hotel bietet einen sehr hohen Standard an Service und Komfort.
This hotel offers a very high standard of service and comfort.

The word 'Standard' is often the head word in many compound nouns. It then describes that something is the normal, usual, or basic version.
Die Standardausrüstung des Autos beinhaltet bereits eine Klimaanlage.
The car's standard equipment already includes air conditioning.
The expression 'zum Standard gehören' means that something is normal and expected. The phrase 'einen Standard setzen' means to establish a new, higher level of quality.
In modernen Wohnungen gehört ein schneller Internetanschluss zum Standard.
In modern apartments, a fast internet connection is standard.
In the meaning 'Qualitätsniveau' (level of quality), 'Standard' is very often combined with adjectives such as 'hoch' (high), 'niedrig' (low), 'gut' (good), or 'einheitlich' (uniform) to describe the quality.
Unsere Kunden erwarten einen gleichbleibend hohen Standard.
Our customers expect a consistently high standard.
When it is about technical rules, you often find 'Standard' in combination with words such as 'technisch' (technical), 'Industrie' (industry), 'Norm' (standard), or abbreviations like 'ISO' or 'DIN'.
Dieser Stecker entspricht dem neuesten technischen Standard.
This plug complies with the latest technical standard.
rule / period
'die Regel' and 'der Standard' can both say how something should be done. A 'Regel', however, is usually a concrete rule: it says what is allowed, what is not allowed, or how one should behave. A 'Standard' more often describes an accepted level or norm that is considered normal, appropriate, or good. In technology and at work, a standard can also be defined very precisely. Learners may confuse the words because both provide guidance. As a practical rule: for behavior and clear instructions, 'Regel' often fits; for quality, technology, or general norms, 'Standard' is more likely.

Dieses Hotel hat einen hohen Standard, deshalb sind die Zimmer sehr sauber und gut ausgestattet.
This hotel has a high standard, so the rooms are very clean and well equipped.
In der Schule gilt die Regel, dass Handys im Unterricht leise sein müssen.
At school, the rule is that phones must be silent during class.