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A tutorial is used to teach material. More interactive and specific than a book or a lecture; a tutorial seeks to teach by example and supply the information to complete a certain task.
Depending on the context a tutorial can take one of many forms,  ranging from a set of instructions to complete a task to an interactive  problem solving session (usually in academia).
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Academia
In British academic parlance, a tutorial is a small class of one, or only a few, students, in which the tutor (a lecturer or other academic staff member) gives individual attention to the students[citation needed]. The tutorial system at Oxford and Cambridge is fundamental to methods of teaching at those universities, but it is by no means peculiar to them; Heythrop College (University of London),  for instance, also offers a tutorial system with one on one teaching.  It is rare for newer universities in the UK to have the resources to  offer individual tuition; six to eight (or even more) students is a far  more common tutorial size. At Cambridge, a tutorial is known as a supervision.
In some Canadian universities, such as the University of Waterloo or the University of Toronto, a tutorial refers to something more like a recitation in an American university, that is, a class of between 12-18 students that is supplemental to a large lecture  course, which gives students the opportunity to discuss the lectures  and/or additional readings in smaller groups. These tutorials are often  led by graduate students, normally known as "Teaching Assistants" (TAs), though it is not unknown for the primary instructor of a course, even if a full professor, to take a tutorial. At Princeton University, these tutorials are known as preceptorials and are led by preceptors. Woodrow Wilson developed the preceptorial system, intending it to be the main form of teaching.
In Australian and New Zealand universities, a tutorial (colloquially called a tute) is a class of 10–30 students. Such tutorials are very similar to the Canadian system, although tutorials are usually led by honours or postgraduate students, known as 'tutors'.
At the two campuses of St. John's College, U.S. and a few other American colleges with a similar version of the Great Books  program, a "tutorial" is a class of 12 - 16 students who meet regularly  with the guidance of a tutor. The tutorial focuses on a certain subject  area (e.g. mathematics tutorial, language tutorial) and generally  proceeds with careful reading of selected primary texts and working  through associated exercises (e.g., demonstrating a Euclid proof or  translating ancient Greek poetry). Since formal lectures do not play a  large part in the St. John's College curriculum, the tutorial is the  primary method by which certain subjects are studied. However, at St.  John's the tutorial is considered ancillary to the seminar,  in which a slightly larger group of students meets with two tutors for  broader discussion of the particular texts on the seminar list.
Some US colleges, such as Williams College  in Williamstown, Massachusetts, offer a tutorials almost identical in  structure to that of an Oxbridge tutorial. At Williams, students in  tutorials typically work in pairs alongside a professor and meet weekly,  alternately presenting position papers or critiques of their partner's  paper.
Internet
Internet computer tutorials can take the form of a screen recording, a  written document (either online or downloadable), or an audio file,  where a person will give step by step instructions on how to do  something.
Tutorials usually have the following characteristics:
- A presentation of content, usually with an example or examples, often broken up into discrete modules or sections.
 - Some method of review that reinforces or tests understanding of the content in the related module or section.
 - A transition to additional modules or sections that builds on the instructions already provided. Tutorials can be linear or branching.
 
While many writers refer to a mere list of instructions or tips as a tutorial, this usage can be misleading.
Computer-based tutoring
In computer-based education, a tutorial is a computer program whose purpose it is to assist users in learning how to use (parts of) a software product such as an office suite or any other application, operating system interface, programming tool, or video game. There are two kinds of software tutorials: movie tutorials that the user views; and interactive  tutorials where the user follows on-screen instructions (and—in some  cases—watches short instruction movies), whereupon he/she does the  tutorial exercises and receives feedback depending on his/her actions.  Some computer based tutorials can also be put up on the Web.