what is ment be " hydroformylation of olefins yields aldehydes which further undergo reduction to give alcohol "?

Hydroformylation is a process of treatment of an alkene with high pressures (between 10 and 100 atm) of Carbon Monoxideand Hydrogen at temperatures between 40 and 200°C. Catalystsare required. hydroformylation of olefins yields aldehydes which further undergo reduction to give alcohol. it means that on treatment of alkenes(olefins) with carbon monoxide and hydrogen in presence of catalyst gives aldehyde. On reducing this aldehyde in presence of reducing agent like Li