What is the difference between LSD and ecstasy?

Speed generally refers to the impure, insufflatable (ie. you can snort or sniff it) form of the chemicals amphetamine or Methylamphetamine. Ecstasy to the chemical MDMA (3,4-Methylenedioxymethamphetamine) which is generally sold in the form of a pill and taken orally. All of these drugs are classed as stimulants but there effects are different.