There are many smart phones and tablets available at the moment. However there are only really 2 types of smartphone common today. They are Android and iPhone (iOS).
Android phones have been available since the end of 2008 with version 1.0 of Android. The latest version is Android 9.0 with most phones still using using earlier versions. Android version are given sweet code names e.g. Nougat (v7.0 - v7.1). For more information on versions of Android look at the Wikipedia page on Android version history.