The Renaissance was a cultural movement developed from the 15th yo to the 17th century. It started in Italy in the late Middle Ages and later spread to the res of Europe.
Renaissance music in European music written during thus period. It is usually divided into three periods: Early Renaissance Music (1400-1467), Middle Renaissance Music (1467-1534), and Late Renaissance Music (1534-1600)

"Texure" in music descibes the melodic and harmonic relationships and the density of the simultaneous different musical components.
There are different textures in music:

-MONOPHONIC MUSIC: It is the simplest texture. There is no harmony and there is only one line of tune. Medieval music is always monophonic.

-POLYPHONIC MUSIC: It's a more complex texture. There is more than one tune plyed at the same time. It was developed during the Renaissance period.

-HOMOPHONIC MUSIC: It is a texture where the lines of musci move at (more or less) the same time. Melodies and chords are good examples of this.

                            OTHER WAYS TO VARY TEXTURE
SOLO: Only one voice or instrument
DUET: A 2-part piece
TRIO: A 3-part piece
QUARTET: A 4-element piece
UNISON: All voices or instruments playing the same notes
TUTTI: All instruments or voices playing at the same time
DOUBLING: One part playing exactly the same notes as another
DESCANT: One part runs higher than the main melodies