What is "slyahooauth" under system services on cellular data of iPhone?

What is "slyahooauth" and why might it appear under system services on cellular data

What is "slyahooauth", and why might it appear under system services on cellular data, under settings on an iPhone? The iPhone I saw it on isn't mine, but I would like to confirm that phone's safety as well.

[Re-Titled by Moderator]