New York (CNN Business) Amazon announced it will spend $700 million over the next six years to help retrain a third of its US workforce to adapt to an economy increasingly disrupted by automation and new technology.

Amazon AMZN The training, which will be voluntary, expands upon Amazon's existing programs and initiatives. The idea is to helpemployees progress into more advanced jobs or even new positions outside of the company. It will be available to 100,000 workers by 2025.

Amazon is calling the plan "Upskilling 2025." Workers could use the training to transfer between positions that, without the training, they might not have been qualified for.

For example, warehouse workers in fulfillment centers could be trained for technical roles in IT and nontechnical workers could be retrained as software engineers, even if they have limited technical background.

Another training initiative, Amazon Apprenticeship, offers paid intensive classroom training and on-the-job apprenticeships within the company. Amazon is also emphasizing its growing cloud business with a training program that helps employees operate in the booming tech business.

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