Is Lord Vishnu and Venkateswara same?

Among the greatest virtues mentioned in the Hindu scriptures, Lord Venkateswara is believed to be one of the most sacred avatars of Lord Vishnu. He is believed to be a human form of Lord Vishnu which He had to do to search for Goddess Laxmi (or Lakshmi) (as per Varaha Purana and Bhavishya Purana). Lord Venkateswara is one of the chief deities of South India and is known by various other names. Lord Venkateswara is also the presiding deity of Tirumala Venkateswara Temple at Tirupati Balaji.