Why floppy disk are not a part of a computer system nowadays?

Because floppy disks could only hold tiny amounts of data, only above 1Mb, where as now days memory sticks can hold over 16Gb, over 16,000 times more data. They are also bigger in size too. Most documents and files wouldn't even fit on a floppy, such as MP3 files (songs) which are about 4Mb.