Licking can be a way for dogs to communicate their needs or emotions. For example, if a dog is hungry, they may lick their owner’s hand as a signal that they want to be fed. Licking can also be a learned behavior.

Dogs may lick their owners or other people for several reasons.
Affection
Licking is a form of affection for dogs and they may lick their owners as a sign of love and attention seeking.
Taste
Dogs have a keen sense of taste and they may lick people to get a taste of their skin or clothes.
Scent
Dogs have a strong sense of smell and they may lick people to gather information about their scent.
Comfort
Licking can also be a self-soothing behavior for dogs and they may lick people to provide comfort to themselves when they are feeling stressed or anxious.
Grooming
Dogs may also lick their owners or other dogs as a form of grooming, especially if they are trying to clean a wound or soothe an irritated area.
It’s important to remember that excessive licking can be a sign of a health problem or a behavioral issue. If your dog is constantly licking themselves, other dogs, or objects, it’s a good idea to consult with a veterinarian to rule out any underlying health issues. In some cases, excessive licking can be a sign of skin irritations, allergies, or other medical conditions that need to be treated.
Conclusion
Overall, licking is a natural behavior for dogs and is often a sign of affection and comfort. However, it’s always a good idea to observe your dog’s behavior and body language to understand the underlying reason for their licking.