In the early days of TV the best way to display text to your viewers was to put a physical card in front of the camera with that text on it, hence the name Episode Title Card. Advances in production meant that later that text could be edited directly into the film rather than having a physical card, and further advances meant that you could even display the text on the screen overtop of a normal scene (an 'overlay'). The overlay text will act like it's stuck to the screen though--it won't move on the screen even if the camera angle changes. Examples of In Scene Title Text include: