Describir: Substance and function :

  _  _     _____     ______     ___                 ___      ______    _____   
 | \| ||  |  ___||  /_   _//   / _ \\    ____      / _ \\   /_____//  |  ___|| 
 |  ' ||  | ||__      | ||    / //\ \\  |    \\   | / \ ||  `____ `   | ||__   
 | .  ||  | ||__     _| ||   |  ___  || | [] ||   | \_/ ||  /___//    | ||__   
 |_|\_||  |_____||  /__//    |_||  |_|| |  __//    \___//   `__ `     |_____|| 
 `-` -`   `-----`   `--`     `-`   `-`  |_|`-`     `---`    /_//      `-----`  
                                        `-`                 `-`