What is Infographic submissions in SEO?

Let me google that for you

That's pretty much all you need to know.

Infographic submission doesn't help to improve your keyword ranking. May be you will get some referral traffics from these sites.If you want you can use your infographic for backlink building.

Step 1: Create and Publish a (Really Good) Infographic
Step 2: Find People That Are Interested In Your Infographic
Step 3: See If They’re Interested In Your Infographic
Step 4: Make Sharing Your Infographic a Breeze (AKA, “The Bribe”)
Step 5: Add a Link In Your Introduction

Jessikaload made a good point. Info Graphic is the healthy trend in SEO now. You can create it based on your niche. It must contains information which might relate with problem solving or buying guide or necessary tools information anything based on your niche demand. You need to study about it that what other people are doing. Then you need to publish it in your own site. You can put source code so that anyone can share it, if interested. You can submit it using free/paid info graphic submission sites. Also you can make it viral using pinterest and other image media.

Also the main thing is you can do Guestographics. This term is created by Brian Dean and he brings a really good idea. Its same to guest posting. So Guest + Info Graphics = Guestographics. Most of the time people are not interested to publish an articles now a day. Because they dont satisfy about the quality of article or other. But its easy to attract the publisher when you send them an info graphic. If your info graphic is easy to read, clean, informative and professional definitely they will publish it. Its a good way to get high value link now a days. And for more you need to follow 2nd comment

The theory behind infographic submissions is that someone would find your image on another site and use it on theirs and link back to your page as the original source. And, this should provide you with a very good backlink, so long as the site linking to yours is high quality and contains information similar to yours. The only problem with infographic backlinking is when someone uses your image and posts it to a site that is considered very poor quality. This could cause you to have problems with Google, who might think you are spamming your links on random sites.

And you're SEO services Miami? Tsk, tsk, tsk.