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Hash functions (e.g. SHA, Ripemd, MD5, Tiger or Whirlpool) are functions which converts a large data into a small datum (usually an integer). Values returned by a hash function are called hash sums, hash values or simply hashes.

You should use hash functions if you want to store passwords in a database (for this programmers use cryptographic hash functions such as SHA, MD5, Whirlpool, Ripemd or Tiger), speed up table lookup or for data comaprison tasks. If you want to use hash functions you can use build in functions (such as md5() and sha() in the PHP) or go to site with online generators, where you can find mostly used algorithms.

Everyone know how important is to enjoy good health. Not only physical, but also mental health. If you want to be healthy you should play sport,  eat healthy food and relax. Your body can tell you if you’re sound. You can use for this a bmi calculator (BMI - Body Mass Index). The BMI calculator is frequently used as diagnostic tool to identify weight problem (e.g. overweight or underweight). BMI compares a weight and a height of a person. If this index is between 18.5 and 25 you are healthy. If it is over 25 you have an overweight and you should do something to be fitness. On a site converter-generator.com you can find more usefull generators and converters.