What is the lock near the url?

[Scinetic]

What is it? I always noticed that the lock is either green or gray, as for example on this forum, and sometimes it is completely crossed out. What does this mean? Is it related to security?

[Allcopstan]

If I'm not mistaken, this is the encryption level set on the site.

[Xiande]

This lock indicates the encryption level on the site. After the site receives an ssl certificates, this lock will appear. Anyone can buy an ssl certificate from ssls.com. The user unknowingly trusts the site after seeing the green lock.

[Muller]

Thanks for sharing such a nice post

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Thanks for sharing such a nice post..