Hi everybody, I'd like to know the difference between "save" and "rescue".
Can you give me some examples please ? hanks in advance.
save- to prevent from danger, avoid it...
rescue- to set free from danger, or something different that may hurt someone or something you're trying to rescue.

Well, there is a lot of differences between them, but you've got to post the sentence...
I saved you from death.
I rescued you from drugs.
I saved a lot of money, then I can travel to Paris next month.
I can rescue you whenever you need, as long as you keep yourself away from crimes.
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Save is to protect some one
"Save" has the sense of "to stash away something," which "rescue" does not. And "rescue" can be a noun, while "save" can only be a noun in the context of sports. However, they are synonymous as verbs, in the sense of "to prevent harm from occurring." But note how different they sound, which can determine their usage. Some examples:

"Save me!" ("Rescue me!" means the same thing. But in a desperate situation this is too formal-sounding, and the shorter, sharper-sounding word would be used.)

"The Coast Guard has been called to rescue those stranded boaters." ("Save" means the same thing, but is too melodramatic-sounding for this official kind of situation.)

"We're circulating a petition to save the St. Regis Building. It's a historic structure built in 1901 and has unique architectural features. They want to tear it down to build a parking garage." ("Rescue" is synonymous, but would not be used in this situation - it's too formal-sounding.)
What is the difference between rescue and save
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In my experience you can identify these general rules as verbs:

Rescue: it is done by intentional effort by people (and possibly a few other species like dogs and dolphins) in an already existing situation, disaster, danger. It is not a preventative action.

Save: Although it can be used in the above meaning, and this is the verb I would use to describe when the saving happens by objects, animals, and/or when it happens without intention.

"saved by the bell"

"He was saved from suffocation by the appearance of a hole in the ceiling of the tiny cave. A stray dog began to dig just at the right place and at the right moment."

In general the concept of saving has to do with preservation and accumulation. In this way it is often used in a future oriented sense.

"The doctors saved the patient's life [from impending death]."

"We were saved from driving off the cliff by the police who closed the road off due to the oil spill on the road. The emergency teams were there already to try to rescue the driver of a vehicle who drove there and slipped off the road earlier."

a skier saved a young boy that got trapped in an avalanche

You explain it very well but I`m confused with this sentence because the skier doesn`t prevent from the danger. He is setting the boy free from it.