# Safe Group
A security group is a function of managing the EC2 port, which is a channel for access application from external access. Let's take opening port 80 as an example to introduce you to the use of security groups.
Login to AWS console and open 【EC2】>【Instances】.
Open 【Description】and then click the name of Security groups.
Enter the setting interface, click 【Inbound】and 【Edit】.
Edit inbound rule and add a new one.