?=s

I have a few advertising CMS articles on the website, I received an email from them this morning asking why the '?=s' is in the URL, eg. /content/438-development-natural-gas-vehicles-ivecoa-s-new-strategy.html ? s = 0123ae3002c2f9d01c4eb7f8f0df5918 The customer is querying why are there soo...