The options for connecting your DSLR to a phone or PC vary depending upon your camera make and model. At the very least, all DSLR cameras have a USB cable you can use to tether your camera to a computer. More compelling, though, is when you have a model that has built-in Wi-Fi, Bluetooth, or near-field communication (NFC) for sending images to phone, computer, or printer.
DSLRs that support wireless communication use an iOS or Android app on your phone or tablet to control the camera wirelessly. You go into the menus to initiate pairing with a device or connecting to a computer. For example, Canon’s Camera Connect v3 uses both wi-fi and Bluetooth, and it lets you do everything, from using it as a remote trigger to using your phone screen as an alternate live view, down to adjusting settings like focus and white balance. You can also view images on the camera, save them on your phone, and share them via social media or other apps.
As for apps for use with your computer, Canon cameras typically support Canon EOS Utility, for remote shooting and downloading images from a memory card. Navigate to Canon’s support page to find your camera and see the available software downloads.
Nikon has several apps for connecting select DSLR models to your phone or computer. NX Tether and Camera Control Pro 2 are both designed for use with Macs and PCs. NX Tether makes it easy to review images on your camera’s internal media, while Camera Control Pro 2 serves as a remote-control trigger. Mobile apps include NX Mobile Air (for quickly sending images from the field), SnapBridge (for using a phone or tablet as a remote trigger, and sharing images via social media).