An alcohol is distinguished in primary, secondary or tertiary depending on how many carbons are attached to the carbon bearing the hydroxile. Primary alcohols have no other carbon, secondary ones have one and tertiary alcohols have two.
Examples:
Primary alcohol: If the hydroxyl carbon only has a single R group, it is known as primary alcohol.

It is known as the agricultural and allied sector services

Secondary alcohol :If it has two R groups, it is a secondary alcohol.
It is known as the manufacturing sector

Tertiary alcohol: If it has three R groups, it is a tertiary alcohol.
It is known as the service sector

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