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The world of multimedia is thriving with the growth of Internet and other new technologies, offering a range of new directions for people who just aren't satisfied with plain old text and images. But what exactly is multimedia? Multimedia has many definitions depending upon whom you ask. A standard definition follows： Multimedia is any combination of text, graphic art, sound, animation, and video delivered to you by computer or other electronic means.
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Multimedia has not been feasible until recently because computers have not been able to deliver an integrated package at an affordable price. In 1975 the first personal computers were marketed with low processor power, black and green text-only screens. By 1980 the addition of hard disk storage and simple graphics was seen. By 1987 we saw the capability to display color, more advanced graphics, sounds, and animation. In 1995 we have the capability to integrate digital video, sounds, animation and text into one hardware and software package. There is increasing emphasis on communications capabilities and sharing information over networks such as the Internet. Multimedia is made possible and affordable today because of increases in storage and speed and decreases in size and cost； this yields an increase in performance and availability.
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Interactivity is amount of control the user has over the presentation of information."Interactive multimedia"refers to multimedia that allows for user control. The three most common classifications of interactive are:
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（1） linear presentation: A linear presentation is one in which the author decides the sequence and manner in which information is presented. The user controls only the pace.
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（2） programmed branching program: A programmed branching program is one in which the user has some control over the sequence of presentation by selecting from a group of choices such as from a main menu. The author still maintains the control of deciding what to include in the choices available at any point in the program.
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（3） hypermedia: Hypermedia can be thought of as a web of interrelated information in whichthe user is in almost complete control of the pace, sequence and content of the presentation. Links provide for random access of information.
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多媒体世界随着国际互联网以及其他新技术的发展而不断兴旺，它为不满足于简单、陈旧的文本和图像的人们提供了一系列新的方向。但究竟什么是多媒体呢？多媒体有许多定义，这要看你是向谁提出这个问题。下面是一个标准的定义：多媒体是通过计算机或其他电子手段向你传送的文本、图形艺术、声音、动画与视频的任意组合。
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直到最近，当计算机能以可负担得起的价格传送一个集成程序包的时候，多媒体才成为可行的事情。1975年，最早的个人计算机在市场上出现，它们具有低速的处理器和黑绿色的纯文本屏幕。到1980年，增加了硬盘存储器和简单图形功能。到1987年，出现了能显示彩色、更高级的图形、声音和动画的功能。1995年，我们已经能把数值视频、声音、动画和文本集成到一个硬件和软件包上。人们在不断强调通信能力和对诸如国际互联网上的信息共享。由于存储容量和速度的增加以及尺寸和费用的减小，目前多媒体已可以实现并可以负担得起了，这就导致了性能和可用性的增加。
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交互性是用户控制呈现信息的程度。"交互式多媒体"是指允许用户控制的多媒体，三类最常见的交互是：
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（1）线性呈现：线性呈现是一种制作者可用来决定信息的呈现顺序和方式的呈现方式，用户只控制速度。
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（2）程控分支程序：程控分支程序是这样的程序——用户可以通过诸如主菜单那样的一组选择而对呈现次序进行某种控制，制作者仍然对程序中任何时刻要有哪些可用选项保持着控制。
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（3）超媒体：超媒体可被认为是相互关联的信息网，用户在这个网中几乎完全控制呈现的速度、次序和内容。链接提供了对信息的随机访问。
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