1) Interchangeable Circular Needles
Circular needles are basically two needles joined by a thin cable. They are commonly used to knit items in a circle, such as a sweater or hat.
|Knitting in the round on circular needles (source: WonderHowTo)|
|Flat knitting with circular needles (source: KnitPicks)|
|Knit Picks Options Interchangeable Circular Knitting Needle Set|
2) Double Pointed Needles (DPNs)
DPNs are also commonly used for knitting in the round, but for smaller diameter patterns such as gloves and socks. I tend to like longer length DPNs since the knitted loops can easily slip off either end of the needle.
|Knitting in the round with DPNs (source: Purl Bee)|
|Knit Picks Double Pointed Needle Set|
If you knit, what needles do you love and recommend?