What is meant by "Weak and Strong syllable" ?

Hello ..,
This the first participation to me in here.I am glad to see your answers and comments .
What is meant by Weak and strong Syllable ?

I'm not a teacher.

A stressed syllable is the syllable emphasized. For example, the word "about" is stressed at the end. You pronounce it as uh-bout. The stressed syllable will most likely be indicated in your English dictionary; it is usually bold.

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