实时多任务操作系统(RTOS)是嵌入式应用软件的基础和开发平台。目前在中国大多数嵌入式软件开发还是基于处理器直接编写，没有采用商品化的RTOS，不能将系统软件和应用软件分开处理。RTOS是一段嵌入在目标代码中的软件，用户的其它应用程序都建立在RTOS之上。不但如此，RTOS还是一个可靠性和可信性很高的实时内核，将时间、中断、I/O、定时器等资源都包装起来，留给用户一个标准的API，并根据各个任务的优先级，合理地在不同任务之间分配时间。
TOS是针对不同处理器优化设计的高效率实时多任务内核，商品化的RTOS可以面对几十个系列的嵌入式处理器MPU、MCU、DSP、SOC等提供类同的API接口，这是RTOS基于设备独立的应用程序开发基础。因此基于RTOS上的C语言程序具有极大的可移植性。据专家测算，RTOS上跨处理器平台的程序移植只需要修改1~5%的内容。在RTOS基础上可以编写出各种硬件驱动程序、专家库函数、行业库函数、产品库函数，和通用性的应用程序一起，可以作为产品销售，促进行业内的知识产权交流，因此RTOS又是一个软件开发平台。
5.RTOS是嵌入式系统的软件开发平台
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