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Anti-aliasing filters are generally used so that when an analog signal is sampled, the effects of aliasing don't appear in the samples. When you sample a signal at a sampling rate fs, you're limited to representing frequencies up to fs/2. If there are frequencies above fs/2 in the signal, they will be "aliased" and will appear as different frequencies in the samples, sometimes overlapping with existing frequency content. Anti-aliasing filters are typically low-pass filters that remove frequencies above the sampling frequency, but the term could be applied to other scenarios as well.
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