Answer:
Each pixel in an image is made up of binary numbers. If we say that 1 is black (or on) and 0 is white (or off), then a simple black and white picture can be created using binary. To create the picture, a grid can be set out and the squares coloured (1 – black and 0 – white).
I would say code completion. Dreamweaver does this for you. So say I wanted to make a paragraph of text, I would use <p>, and then Dreamweaver would create the closing </p> for you.
A security certificate is used to ensure that your web browser and the server you are connected to have a tamper-free, secure connection.