For questions about && and OR, I would like to have an example

For questions about && and OR, we hope to have an example
Having a problem for a long time did not understand his meaning! Looking for some cases to look at, very novice

What do these two mean, if they are true after what they do next, && or

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&& is meant to be, which means that several conditions must be set up at the same time to execute the following statement
Or is a living meaning, that is to say, as long as one of the conditions or all the conditions are established can be
@ Simple point is the meaning of fault tolerance
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The first sentence, if the directory does not exist, create a directory
The second sentence, if the write file fails, the output error message

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