Purpose of opening credits:

The main purpose of the opening credits would be to set the scene and to give the audience a foundation for the movie. This could determine straight away for an audience whether or not the movie is worth watching. It would also give the audience an idea of what is going on in the movie and what has happened in the past or even in previous movies if the movie is a sequel. This could also create interest in other movies or spin-offs, for example Marvel movies now have spin-off shows such as Marvel Agents of Shield. Marvel fans who were interested in the Avengers could start to generate interest in the show. During the shows season it could also spark up interest in the upcoming movies. On a basic level the opening credits display the actors and the roles that they are playing in the film. This is effective as it may attract a specific target audience who are fans of a particular actor.

Difference between opening credits and the title sequence:

The title sequence primarily focuses on the presentation of the film's title. Compared to the opening credits which includes important members of the cast and crew being displayed on the screen, it can also being accompanied with a song or acting in the background. The title sequence is was segregates the opening credits from the main opening action of the film.

What techniques can be employed in an opening sequence:

A popular technique is showing an establishing shot of the location. This is popular because it allows the audience to know where they are and not be confused or unaware of what is happening in the shot and the beginning of the story. Another technique is having a close up of a main character in the film or TV show. This leaves the audience wondering who this character is and creates a feeling of mystery and suspense.