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"Sola Scriptura" is a Latin phrase. To find out what it means, let us look at what each individual word translates to.
We can quite easily make a guess on what "Scriptura" means. If you said, "Scriptures", then you're pretty accurate! It actually translates to "writings", but refers to the Scriptures.
"Sola" as a noun, can be translated to "bottom", "ground" and "floor". As a verb however, it carries the meaning of "single", "alone", "having no companion" and "unique".
Put together then, we get "Scriptures Alone".
"Sola Scriptura" is a Christian doctrine that the Bible alone is authoritative for the Christian faith. It is complete, infallibale and inerrant, and contains all necessary knowledge for salvation and holiness. "Sola Scriptura" was a rallying cry of the Protestant Reformation against the rule and practices of the Roman Catholic Church of the time.
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Inerrancy in Christianity is another doctrine that holds the Bible to be accurate and without error. Most Evangelical Christian denominations hold to this teaching.