The move is a coup for Amazon Web Services, but it also underscores the tightening interdependence among big software companies. Amazon is a big client of Salesforce.

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Salesforce, a big provider of cloud-based software for businesses, said Wednesday that it has picked Amazon as its primary provider of public cloud infrastructure.

The move, by one of the world’s biggest software companies and one that helped pioneer corporations’ transfer of their computing needs from their own data centers to the online world, is a coup for Amazon Web Services, as the tech giant’s cloud-computing business is known. Competition, after all, is heating up between AWS and other deep-pocketed providers of cloud infrastructure such as Microsoft and Google. (Microsoft at one point weighed a bid for Salesforce, according to media reports.)

It also underscores the tightening interdependence among big software companies. For Salesforce, which helps businesses deal with burgeoning amounts of customer data, is also a provider of software solutions to Amazon.

“I would say we love Amazon,” said Salesforce CEO Marc R. Benioff, in a recent conference call, who added that the Seattle company is a “huge user of Salesforce.”

Benioff also claimed an ideological kinship with Amazon.com Chief Executive Jeff Bezos, with whom he shares “a great meeting of the minds of the future of the cloud.”

In an Amazon news release, Amazon said that Salesforce will use AWS to strengthen its planned international expansion.