A chain that describes the flow of energy and nutrients from one organism to the other in an ecosystem is called a food chain.
The plants or producers are the basic levels of the food chain that produces energy and is transferred to the higher levels i.e to the herbivorous or primary consumers.
These primary consumers are further consumed by the secondary and tertiary consumers.
Food webs:
Food webs are the interconnection or inter-linking of different food chains.
For example if one food chain consists of plants(producer) ⇢ grasshopper(primary consumer) ⇢ scorpion(secondary consumer) ⇢ fox(tertiary consumer)and the other food chain contains plants(producer) ⇢ ground squirrel(primary consumer) and this squirrel can be eaten by the fox(tertiary consumer of first food chain) and eagle(secondary consumer of second food chain).
Final answer: Interconnected food chains are called food webs.