Besides green bar, I have also come across other colors on my browser. What do they mean?
Besides green, you may come across sites with different coloring in the address bar:
The website' s certificate has expired, is not valid or has an error. If it is your website, you should contact us as soon as possible, in order to investigate the problem that has arisen.
The validity of the certificate or carrier issue can not be verified. This may be an indication that there is a problem with the website of the issuer of the SSL certificate.
If the site you are viewing has "https" address and the relevant padlock icon means that this website uses a lower security level certificate. The communication with this website is encrypted.