PS6 Adjusting the DPI on a group of photos

We have a large project that we want to try reducing the DPI on the graphics.  I am new to photoshop and wondered how to do it and if you can do it in a batch?
Thank you,
Susan

DPI is pixel density and is important for printers changing the DPI without resampling the image the images pixel size does not change just the print size changes.
For Web Pages, Display and e-mail  what is important is the number of pixels you have.  For Web pages are created for some pixels sizes like 1024x768 where images are  800 px wide and 600 px high for Display have a fixed DPI and can display just so many pixels.
So are you adjusting print size or are you reducing image pixel size so it will fir on a display?

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