Definition & Meaning of "the straw that break the camel's back"in English

What is the origin of the idiom "the straw that breaks the camel's back" and when to use it?

The idiom "the straw that breaks the camel's back" is a metaphorical expression used to describe the final, seemingly insignificant event or burden that causes a person or system to collapse or reach a breaking point. The origin of this idiom can be traced back to an ancient proverb that refers to the physical weight limit of a camel or donkey carrying a load. Beyond a certain point, even the addition of a small straw can cause the animal's back to break.