Double Exposure: A blend of two photos together to make one.
Black and White: An image without any color. Only has shades of black and white.
Emphasis: A black and white photo that only has a portion of the photo in color to make that part pop out.
Sepia: A photo that is only shades of brown and orange. Warmer then a black and white photo.
Silhouette: A picture that is created (naturally) with a light source that makes the rest black and dark.
Boat-in-Hand: A illusion picture that makes things seem bigger, smaller, or in a different location in comparison to another object or person.
Rule of thirds: When a picture is divided by three lines (up or down) the focus of the image will land on the lines making that part more visionally appealing. It also defines the balance of the image because the image will not seem balanced if there is something on the line on the left and nothing on the line on the right.