A slide is a single page of a presentation

Presentation

Presentation is the practice of showing and explaining the content of a topic to an audience or learner. Presentations come in nearly as many forms as there are life situations...

. Collectively, a group of slides may be known as a slide deck. Historically, a slide was created on a transparency

Transparency (projection)

A transparency, also known in industrial settings as a "viewfoil" or "foil", is a thin sheet of transparent flexible material, typically cellulose acetate, onto which figures can be drawn. These are then placed on an overhead projector for display to an audience...

 and viewed with an overhead projector

Overhead projector

An overhead projector is a variant of slide projector that is used to display images to an audience.-Mechanism:An overhead projector typically consists of a large box containing a very bright lamp and a fan to cool it. On top of the box is a large fresnel lens that collimates the light...

. In today's digital age, a slide most commonly refers to a single page developed using a presentation program

Presentation program

A presentation program is a computer software package used to display information, normally in the form of a slide show...

 such as Microsoft PowerPoint

Microsoft PowerPoint

Microsoft PowerPoint, usually just called PowerPoint, is a non-free commercial presentation program developed by Microsoft. It is part of the Microsoft Office suite, and runs on Microsoft Windows and Apple's Mac OS X operating system...

. It is also possible to create them with a document markup language, for instance with the LaTeX

LaTeX

LaTeX is a document markup language and document preparation system for the TeX typesetting program. Within the typesetting system, its name is styled as . The term LaTeX refers only to the language in which documents are written, not to the editor used to write those documents. In order to...

 class Beamer

Beamer (LaTeX)

Beamer is a LaTeX class for creating slides for presentations. It supports both pdfLaTeX and LaTeX + dvips. The name is taken from the German word Beamer, a pseudo-anglicism for video projector....

.

Lecture

Lecture

thumb|A lecture on [[linear algebra]] at the [[Helsinki University of Technology]]A lecture is an oral presentation intended to present information or teach people about a particular subject, for example by a university or college teacher. Lectures are used to convey critical information, history,...

 notes

Notetaking

Notetaking is the practice of recording information captured from a transient source, such as an oral discussion at a meeting, or a lecture. Notes of a meeting are usually called minutes. The format of the initial record may often be informal and/or unstructured. One common format for such notes is...

 in slide format are referred to as lecture slides, frequently downloadable by students in .ppt or .pdf format.