Drip Tubing: aka Poly Tubing, Poly Pipe, Supply Line: Common term for Polyethylene pipe. Flexible, black tubing used for both drip irrigation main and lateral lines. Emitters can be inserted into tubing or connected via micro tubing. Common sizes are 1/2" (aka 5/8") or 3/4" tubing.
Micro Tubing: aka Feeder Tubing: 1/4" micro tubing can be used as the main line for small deck/flower-pot installations but is more often used as a lateral supply line off of 1/2" main line tubing. The micro tubing carries water to emitters (drippers) and micro sprays. Also referred to as “Distribution Tubing” it is available in Polyethylene (PE) or the more flexible Poly Vinyl Chloride (PVC).
Compression Fittings: Fittings used to connect lengths of 1/2" and 3/4" solid drip tubing. The drip tubing is inserted into the compression fitting. The fittings internal compression ring squeezes the tubing slightly making a secure water-tight seal. Compression fittings are more of a permanent connection and are not recommended for reuse. Glue or lubricants are not required.
Ref 2004