Strainers come in different shapes and sizes which can seem confusing at the start. Let's demystify strainers:
From left to right are the cone shaped strainer, bowl shaped strainer and the chinoise
This strainer is larger and wider in size and therefor better for larger quantities of like pasta that you wish to strain in the sink. This strainer spatters a lot and doesnt funnel the liquid like the other two shaped strainers do. But that doesnt matter when you have this strainer in the sink and the water splashes down in the sink and down the drain.
The cone shaped strainer is for smaller quantities and more suited for when you wish to keep the liquid and possibly discard the solids that stays behind for example beef stock. THis strainer also have the handle and metal tongue to keep the strainer in place over the pot/container into which the liquid gets strained.
THe chinois is shaped as well but with a sieve texture for finer straining. This is for when you wish to keep smaller particles from ending up in the strained liquid for instance when you strain a sauce to get rid of lumps or pieces or when you juiced oranges and you prefer a clear juice free from fibres. This strainer is not a good idea when you are in a hurry for it obviously takes longer for the liquid to drain.