I believe "digitally develop" is an "anonymous" way to describe the use of specialized software to deal with the usually-proprietary-and-varying-by-brand RAW file format. This software usually comes with the camera or you can buy the Adobe plug-in (or Photoshop CS which includes the plug-in). Any of these softs enable extra control over your images. For me with my Canon S50 this means I can shoot a RAW photo (as opposed to jpeg) and *all* the data that the camera captures is saved. Nothing is deleted for the sake of a smaller (jpeg) file. This RAW file on the S50 is usually about twice the size of the best jpeg setting. Another disadvantage is it takes a bit longer for the S50 to write the data and be ready for the next shot. The "batch converting" reference is to software (Photoshop for example) that allows you to change a number of images with a single command. This means you can click one button and convert all your RAW format photos to a more portable file format. Then you can go back and see which shots could use some RAW tweaking and re-import those.
I'm thinking how funny this is--I'm a computer geek and this part makes perfect sense to me. What I am trying to learn is your field of expertise--photography, and I'm still daunted by all the parameters and their interrelationships.