According to Wikipedia, rapping is a little bit different to singing because it is more like talking but timed with rhythm over music. Someone who raps is called a rapper, or sometimes
an MC (Master of Ceremonies).

Rapping can be done over music of many types, including jazz, house, reggae and many
more. One genre of music that includes a lot of rapping is hip hop. 

Today, rapping is a very popular style of vocals. Many of the best-selling artists in the world use it in their music. But rapping was started by African Americans in New York in the 1970s, so it has quite a long history.

Rap is also a modern form of poetry. Rap songs are written in stanzas (estrofes) of two or three verses.  A verse is made up of two lines that rhyme with each other. Take a look at this example:
 

Migration is the movement of people
From one place to another.
Many come to America, look at Marie,
Her parent came when she was just three.
They were pulled by money and opportunity 
And pushed by a lack of jobs that led to poverty.

A rap song can have different stanzas. The stanzas are usually separated by a catchy
(que enganxa) chorus. Look at the example:

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Push factors, push people away 
From the place where they stay,
Pull factors, pull people into a new place,
We hope for a new day.

 

What about you? Can you rap?