@Mammmood - RS-232 is still a valid standard for personal computers if you need the capability to test specific serial ports. You may have to use an RS-232 adapter depending on your hookups.
Personally, I think USB is far better for all other applications, especially for data transfer. USB is basically a one-size-fits all glove that works with a lot of devices and makes data transfer a breeze.
RS-232 by contrast was not always implemented correctly. Not everyone adhered to the standard so in many cases you needed patch boxes to correct the shortfalls, like correctly applying voltage levels to each pin. You shouldn’t have to be a hacker to use computer equipment. Good riddance to this standard.