Keywords in software development: C language keywords include data types such as int, char, float, double, short, long, unsigned; storage types like extern, static, register, auto; and other important terms. The document also covers new keywords added for the 80C51 microcontroller by Keil software including at, alien, bdata, bit, code compact far interrupt using data idata pdata xdata sbit sfr Sfr16 reentrant. Each keyword's significance and usage are explained.
