Hip-hop is different from rap because rap is very poetic but it has a beat to keep a steady flow, (a beat as in drums or anything that makes a short sound) It (was) started/influnced with/by the James Brown song "The Big Comeback"
Hip-hop got mixed up with rap when Run-D.M.C. came in, they created songs that were a mix of both styles, such as "King of Rock", it had poetic lyrics, drums and guitar which had savory rhythm. Run-D.M.C. were very good with poetry and they used Hip-hop melodies and rap beats mixed in their songs.
Modern Hip-hop is called rap but it isn't very poetic, it is almost like 80's Hip-hop but the reggae influence has been replaced with synth, the modern "rappers" are actually Hip-hop artists but the average person calls them rappers because it is shorter than "Hip-hop artist". Out of the laziness of people to say 2 words instead of one; Hip-hop and rap have been mixed up.
Rap is dead these days and the last rappers were Run-D.M.C. and maybe Tupac.
I do not like modern Hip-hop cause the artists try to make catchy, rhyming lyrics but because they don't have poetic minds they have to slur and mispronounce words to make them rhyme. Example: the song "Throw some D's" you hear the word "caddilick" a lot. I listen to the song ju...
The music its self evolved from earlier and other 1970's black American muisic, such as Disco, Funk and Jazz.
This music paired with certain Jamaican cultures led to the use of MC's talking over the music at live shows, which would later progress into what is now known as rapping.
Other important elements to the culture include grafiti, dance (b-boys) and especially Dj'ing. Early Hip Hop music was made by a DJ using his turntables, mixer and records. The arts of cutting and mixing were used to sample parts of records to create a whole new track.
In todays sense, Hip Hop has developed huge mainstreem success, and Gangsta Rap has become less about the music and more about comercialism, making money and 'pimpin bitches.'
There is, however a large underground Hip Hop following, which vows to stay true to Hip Hop. Madlib being a prime example of a true Hip Hop artist.
hip hop today have generally 2 sides:
The first sings about girls, love and 'mama' accompanied with a soft & smooth beat to indicate the tenderness within the African American community.
The second is a more rough and jumpy tune with violence/hyper-sexual themed music video that shows the manliness and powerfulness of the blacks.
the expression "hip hop" was like a way to describe their "hip hop" from their old culture trying to fit into a new one..
i hope this helps.