Read the following essay. Then explain how each paragraph contributes to your understanding of the topic of ukuleles.
Passage
The ukulele is a simple instrument that has become a valuable part of both traditional and modern music. The ukulele, sometimes called "uke" for short, is a small musical instrument shaped like a guitar but with four strings instead of six. Ukulele strings today are typically made of plastic, but they were originally made of catgut. There are six sizes of ukulele: sopranino, soprano, concert, tenor, baritone, and bass. Compared to an acoustic guitar, the ukuleles range in pitch from almost two octaves higher than the highest note on a guitar to one octave higher than the lowest note on a guitar.

These instruments and their delicate, light music are usually associated with Hawaiian culture, but they arrived to the islands by way of Portuguese travelers. The word "ukulele" comes from the Hawaiian words for "gift" (uku) and "to come" (lele), meaning "the gift that came here," as Queen Lili'uokalani called the instrument. Hawaiian royalty were very important in making the uke a vital part of the local culture and traditions.

The ukulele was popular in the early 20th century before it declined after World War II. In the 1990s, a Hawaiian musician, Israel Kamakawiwo'ole, covered two famous songs — "Over the Rainbow" and "What a Wonderful World" — launching the instrument back into the limelight. This resurgence in the uke's popularity was bolstered by the Internet: Beginners could watch instructional videos, look up tabs, and record their own song covers on this simple yet enchanting instrument in a way that they never could before.

The ukulele is now a vital and important part of the broad music scene in the United States, as well as a long-standing tradition in Hawaiian culture.