Father vs. Dad
Main DifferenceFather is male parent of a child who is actually responsible for child's birth by sharing his DNA. The man who just gave up his sperm for child birth is father and may or may not shares in child's development. Dad is affectionate with his child, who actively participate in the growth, development and grooming of the child. Although both terms are used in same manner commonly but it is easier to be a father than dad in actual meanings.

Difference Between Father and Dad
Father vs. Dad
Father is biologically responsible for his child's birth but dad may or may not be.
Father vs. Dad
Father may be affectionate to his child but dad is surely affectionate to his child
Father vs. Dad
It is quite is to be a father than to be a dad.
Fathernoun
A (generally human) male who begets a child.
My father was a strong influence on me.My friend Tony just became a father.Dadnoun
(informal) A father, a male parent.
He hadn't seen his dad in years.Fathernoun
A male ancestor more remote than a parent; a progenitor; especially, a first ancestor.
Dadnoun
(familiar) Used to address one's father
Happy Father's Day, Dad!Fathernoun
A term of respectful address for an elderly man.
Come, father; you can sit here.Dadnoun
(slang) Used to address an older adult male
Fathernoun
A term of respectful address for a priest.
Dadverb
(transitive) To throw against something; to dash.
Fathernoun
A person who plays the role of a father in some way.
My brother was a father to me after my parents got divorced.The child is father to the man.Dadnoun
an informal term for a father; probably derived from baby talk
Fathernoun
The founder of a discipline or science.
Albert Einstein is the father of modern physics.Fathernoun
Something that is the greatest or most significant of its kind.
Fathernoun
A senator of Ancient Rome.
Fatherverb
To be a father to; to sire.
Fatherverb
(figuratively) To give rise to.
Fatherverb
To act as a father; to support and nurture.
Fatherverb
To provide with a father.
Fatherverb
To adopt as one's own.
Fathernoun
a male parent (also used as a term of address to your father);
his father was born in AtlantaFathernoun
the founder of a family;
keep the faith of our forefathersFathernoun
`Father' is a term of address for priests in some churches (especially the Roman Catholic Church or the Orthodox Catholic Church); `Padre' is frequently used in the military
Fathernoun
(Christianity) any of about 70 theologians in the period from the 2nd to the 7th century whose writing established and confirmed official church doctrine; in the Roman Catholic Church some were later declared saints and became Doctor of the Church; the best known Lation Church Fathers are Ambrose, Augustine, Gregory the Great, and Jerome; those who wrote in Greek include Athanasius, Basil, Gregory Nazianzen, and John Chrysostom
Fathernoun
a person who holds an important or distinguished position in some organization;
the tennis fathers ruled in her favorthe city fathers endorsed the proposalFathernoun
God when considered as the first person in the Trinity;
hear our prayers, Heavenly FatherFathernoun
a person who founds or establishes some institution;
George Washington is the father of his countryFathernoun
the head of an organized crime family
Fatherverb
make children;
Abraham begot IsaacMen often father children but don't recognize themWhat is Father?
Father is biologically responsible for the birth of child. He is the male parent of child who denoted his sperm for child’s birth. Child has the DNA of his father. He may or may not perform his role for the care and development of the child. All the fathers are not perform their duties towards their children. Many fathers have a believe that once the baby is born, their responsibility is no more. He may provide shelter food and shelter to the child and family but is unaware of his child’s nature. He even don’t know the likes and dislikes of his child. He don’t know what is status of his studies and even has no care of child’s mental development.
What is Dad?
Dad is affectionate to his child. He creates friendly environment for his child. he is just a like a friend of his child who takes care of his each and every thing. Dad may also be a biological father but not compulsory, he may be a step-father, his uncle, grandfather or a big brother. Dad play important role in the nourishment of his child and his education. Dad is always there for his child through thick and thin as a best friend. He plays with his child. He is the one who creates confidence in his child. Dad is a relation of extreme love and emotions with his child.