The Dual in line packages are probably the most common through hole packages you’ll encounter and work with. They are rectangular and the pins are arranged in a parallel fashion on the left and right. The pins are 2.54mm away from the other and fit perfectly in bread boards and prototyping boards.
The pins are many unlike that of the LED, resistors and transistors. There are ICs with 8 pins, 10 pins, 12, 14, 16, …..28 pins and many more. You will always have to checkout for the function and pin-outs of every particular IC you come across before you can use it well. But in any case there is something that is common with them all, the pin-counts
The pin-count identifies every pin on the IC with a particular number so that it can be referenced easily. Its international and are used on all datasheets.
very interesting