https://www.leafly.com/learn/consume/dabs/rosin-how-to

Many confuse “rosin” and “resin” because the two terms sound so similar. Broadly speaking, resin is the sticky substance secreted by trichomes on marijuana plants. If you smoke enough flower in a pipe or bong, there will be a buildup of resin in it.

Resin can also be a type of concentrate extracted from cannabis through a solvent extraction method, involving chemicals such as butane, propane, etc., in a closed-loop extraction system.

As we’ve mentioned above, rosin is solventless—it is extracted through heat and pressure, without any chemicals. Both resin and rosin are made from dried cannabis material.

These extracts can be complicated further with the terms “live resin” and “live rosin”—the “live” simply means that frozen cannabis plants were used to produce them instead of dried flower.

The process for making rosin is typically more labor-intensive and costly, so rosins tend to be more expensive than resins. Because rosins are solventless, they are thought to be cleaner because they don’t use chemicals.

As resins require solvents and a closed-loop system, they should only be created by licensed professionals in a certified lab.