The Spanish letter C can be pronounced in two different ways.
1. When the C precedes E or I, it is a soft C and is pronounced like a TH (in Spain)* or an S (in Latin America). IPA symbol: [s]
2. When the C precedes A, O, U, or a consonant it is a hard C and is pronounced like a K. IPA symbol: [k]
* This is what you will hear in the sound files.
Please note that this explanation is only a guideline for the Spanish that I know, which is Castilian Spanish. There are many regional variations in Spanish pronunciation.
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