A snapchat streak referred to as Snapstreak is a feature of the social application snapchat in which two people exchange snaps or photos and videos in a particular day to try to have the longest snapchat streak. Streak is made after three days turn taking to snap. This is the rule that has to be complied for the both users to be able to save the streak – neither of them can send at least one snap in the 24hours period to another. More importantly one has to take note of the fact that in case of snapchats just the snaps, which are created, contribute towards the enhancement of the active streak and not the simple text messages
More information: https://techybrain.net/longest-snapchat-streak/