This article presents the research results from a study that was conducted on Spanish youths aged 25-29 years who are neither in employment nor education and training (NEET). Their characteristics were analysed as well as the differential aspects in relation to people who are in employment, education or training. A typology of NEETs was also established based on their availability for and attitude towards employment, and the similarities and differences between the diverse subgroups were analysed. A mixed methodology was used: a quantitative perspective, which enabled a statistical and regression analysis using data that were obtained through questionnaires, and a qualitative perspective based on a biographical interview, which made it possible to focus on perceptions and processes. The results enable us to identify the common characteristics of the NEET population as well as the perceptions and determining factors of the three typologies.