*Chainsaw* = a portable saw with a chain of sharp teeth that runs around a guide bar. Used to cut wood fast.
*Main types*
**Type** **Power** **Best for** **Pros** **Cons**
**Gasoline/Petrol** 25cc - 120cc Tree felling, firewood, farm work Most power, no cord, all-day runtime Noisy, fumes, more maintenance
**Battery/Lithium** 18V - 80V Pruning, yard work, light firewood Light, quiet, instant start, no fumes Limited runtime, less power
**Electric Corded** 120V/240V DIY, small jobs near outlet Cheap, light, low maintenance Cord limits you, less power
*Key parts*
- *Bar*: The metal guide. Common lengths: 12" to 36". Longer bar = bigger trees
- *Chain*: Pitch and gauge must match the bar. Types: full chisel = fast, semi-chisel = safer
- *Engine/Motor*: Drives the chain. RPM ∼10,000-14,000