Before the Internet rose to mass use through the 1990’s, just finding a list of places to -maybe- send hard copies of your writing to involved a trip to the library (or the purchase of an expensive directory that listed writing markets), and a lot of time to go through a thick book (or several) and try to find out which publishers to contact. Then, hope they were still in business by the time your material reached them in the mail!
Today, we writers have got it comparatively easy as far as getting our work to readers is concerned. We can self-publish electronically, or submit our writing to publishers for consideration without even having to print out the manuscripts, pay for postage, envelopes, and return postage (and ink for the printer), and then wait a long time for an answer that may not come. Today, things are much faster and easier, and cheaper!
Here’s a video where I talk about it some more and show one of the writing market directories in book form that I used to use: