- 笔记本电脑是自带屏幕和字母数字键盘的小型便携式个人电脑，重量通常在1至3千克左右，屏幕尺寸大多在280至430毫米之间。随着计算机技术的发展，笔记本电脑的体积越来越小，重量越来越轻，而性能却越发强大。为了要缩小体积，笔记型电脑通常需要有液晶显示器，部分机种还有触屏。除了键盘以外，笔记本电脑还装有触摸板或触控点作为定点设备，也可以用USB或Thunderbolt连接其它外部设备。 就现在来看，笔记本电脑从用途上一般可分为4种类型：商务型、性能型、多媒体型、特殊用途。商务型笔记本电脑的设计强调便携性优秀、电池续航时间长，功能上比较偏重于文字处理功能和信息安全，拥有较小较薄的显示屏和机身；性能型笔记本电脑也称游戏型膝上电脑，注重处理器主频和图像渲染能力，有大屏幕、高分辨率、内存大等特征，一些型号还拥有独立显卡来保障帧率，但价格、便携性、散热和电池续航等“适用”方面的评分往往都不出色；多媒体型笔记本电脑也称全能型笔记本或通用型笔记本，讲究多方面平衡的综合性能，有较出色的屏幕分辨率和扬声器音色，电池续航和散热能力也中规中矩，性价比也较高；而特殊用途笔记本电脑是服务于专业人士，可以在酷热、严寒、低气压、沙尘、暴雨、战场甚至水下等恶劣环境下使用的机型，通常这种机型讲求构造坚固、性能可靠。
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