'What is the difference between operator "=" and "==" in Bash?

It seems that these two operators are pretty much the same - is there a difference? When should I use = and when ==?

bash operators

Solution 1:^[1]

There's a subtle difference with regards to POSIX. Excerpt from the Bash reference:

string1 == string2
True if the strings are equal. = may be used in place of == for strict POSIX compliance.

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Solution	Source
Solution 1	Dominic Rodger