For recycling...

4 recycling,

Recyclable materials includes
-many kinds of glass, paper, metal, plastic, textiles, and electronics.

Although similar in effect, the composting or other reuse of biodegradable waste – such as:
food or garden waste – is not typically considered recycling.

Materials to be recycled are either brought to a collection center / picked up from the curbside, then sorted, cleaned, and reprocessed into new materials bound for manufacturing.

In a strict sense,

recycling of a material would produce a fresh supply of the same material, for example,
office paper to more office paper, or used foamed polystyrene to more polystyrene.

However, this is often difficult or too expensive (compared with producing the same product from raw materials or other sources),
so "recycling" of many products or materials involves their reuse in producing different materials (e.g., cardboard) instead.

Another form of recycling is the salvage of certain materials from complex products, either due to their intrinsic value (e.g., lead from car batteries, or gold from computer components), or due to their hazardous nature (e.g., removal and reuse of mercury from various items).