Difference between Resume, CV and Bio Data

Though we tend to mix up the three terms - Resume, CV and Bio Data, they are different, subtly.

Resume:
Resume is a French word meaning "summary". A resume is ideally a summary of one's education, skills and employment & is used when a person is applying for a new job. It is usually 1 or 2 pages long. Resume is generally preferred by recruiters along with job applications

CV - Curriculam Vitae
Curriculam Vitae is a Latin word meaning "course of life". It is more detailed than a resume, generally 2 to 3 pages, or even longer as per the requirement. It indicates candidate's professional education and experience. A CV is usually preffered by academics for educational and training purposes.

Bio-Data:
Bio Data is the short form of Biographical Data. In a bio data, the focus is on personal particulars like date of birth, gender, religion, race, nationality, residence, marital status etc. Bio-data is usually exchanged for marriages.