What does "binding job offer" mean?
"Acquisition of Blue Card has several requirements. The applicant must have a work contract or binding job offer with a salary of at least 1.5 times the average gross annual salary paid in the Member State."

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It means a definite commitment to have work/a contract.  If something is 'legally binding' it means to the two parties are committed and cannot change their minds (they are metaphorically 'tied together').

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"Binding job offer" means a job offer that is formal and official, where the employer is bound to give you the job.  So, for example, if the company gives you a formal job offer letter and asks you to sign and send back, that may be considered a binding job offer.  They may require something even more formal, such a legally binding contract for a job.  It may depend on the country.

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