电子书是指将文字、图片、声音、影像等讯息内容数字化的出版物和植入或下载数字化文字、图片、声音、影像等讯息内容的集存储和显示终端于一体的手持阅读器。代表人们所阅读的数字化出版物，区别于以纸张为载体的传统出版物。电子书通过数码方式记录在以光、电、磁为介质的设备中，必须借助于设备来读取、复制和传输。
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