As Alan Klein suggests, digital technology brings up the option to have an autoplaying slideshow which delivers the photos as a movie. May, or may not, have music, sound effects, titles, and/or short clips of actual video. May be projected on a big screen, but more likely shown on a TV.*
So which is better: A manual slide show with the narrator stopping to explain the shots and answer questions? Or a slideshow movie which plays from start to finish with little or no interruption?
*BTW, I would like to point out that that looking at photos on a TV can be an OK experience, but a phone, tablet, or laptop computer is a terrible way to show photos; especially true if your audience is more than one person.