的
de
的 is a tag you tie onto the thing
The picture A hand tying a small tag onto an object. Everything before 的 is what is written on that tag.
Where the picture shows up in 的
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the tag says whose
这是我的工牌。
zhè shì wǒ de gōngpái
This is my staff badge.
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a whole clause on the tag
昨天来的那个人是谁？
zuótiān lái de nàge rén shì shéi
Who was that person who came yesterday?
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the tag alone, thing left out
我要热的，不要冰的。
wǒ yào rè de, búyào bīng de
I will take a hot one, not an iced one.
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the tag says what it is made of
这个箱子是塑料的。
zhège xiāngzi shì sùliào de
This box is plastic.
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a tag on the whole sentence
别担心，会好的。
bié dānxīn, huì hǎo de
Do not worry, it will be fine.
Sentence-final 的 nails down that this is simply how things are. It has nothing to do with possession.