Established TCP Connections in Log

I am very much a beginner to mikrotik. I see some items in my log which I am intrigued by, I have no idea what they indicate. The items state,

memory>pptp, info> tcp connection established from xxx.xxx.xxx.xxx

I see multiple of these particular entries, approximately 20 entries per day. Could someone please assist and shed some light on these particular log entries? Are they malicious, or are they normal entries.

Thank you, I appreciate it.