In German, most nouns form their plural by adding -e, -n, -er, or by using an Umlaut. However, the ending -s is used in specific categories. While it applies to all three genders (masculine, feminine, and neuter), its usage is restricted to certain types of words.
Many modern words borrowed from other languages take an -s in the plural. This is especially common with words that still feel "international."
Note: English words ending in -y always take -s in German, and unlike English, the spelling does not change to -ies.
If a noun ends in a full vowel like -a, -i, -o, or -u, it almost always takes an -s.
Words that are abbreviated or clipped versions of longer words use the -s ending.
When referring to a family or a group of people with the same name, German adds an -s.
Specific Northern German seafaring terms often take -s, such as die Decks (the decks) or die Kais (the quays). Additionally, in colloquial or informal speech, people often add -s to words referring to people, though this is often considered non-standard.
Important Reminder: Be careful with words ending in -er (like der Computer). Even if they are loanwords, they usually follow the German rule for -er endings and do not take an -s (die Computer).
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