What is the difference between career planning and career development?

Career planning is about deciding what you want to do$,$ while career developing is about developing the skills needed to accomplish it$.$

Career planning is something you can do on your own, while career development requires some type of formal training.

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Career planning takes little effort, while career development might take years to build the skills needed to have a career.

There is no difference between these two terms, most people use them interchangeably.