Your question is pretty vague, but here is what I can tell you.

Any Sony A-mount lens will fit their SLT line of cameras. In addition the Minolta A-mount lenses will also fit. Minolta started the A-mount when they came out with their Maxxum line of film cameras around 1985 or so. When Sony purchased Minolta in 2006 and started their Alpha camera series they chose to use the A-mount that Minolta had created. They stayed with the A-mount when the introduced the SLT series a few years later. Note that Minolta lenses that are not A-mount (which is any Minolta lens made prior to the introduction of the Maxxum line in 1985) will NOT fit the Sony A-mount cameras.
You also have many choices from Sigma and Tamron, which make lenses to fit other manufacturers cameras, including Sony. I have never used Tamron myself, but Sigma lenses are very good and significantly less expensive than Sony lenses of the same description and category.