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Everything ends, in our case we are talking about words - every word also ends. If it is basic form it just ends with some letter, but it can also end with the suffix. What is it and why it is so important? In linguistics, a suffix (also sometimes called a postfix or just ending) is an affix which is placed after the stem of a word. Common examples are case endings, which indicate the grammatical case of nouns or adjectives, and verb endings, which form the conjugation of verbs. Suffixes can carry grammatical information (inflectional suffixes) or lexical information (derivational suffixes).

Inflectional suffixes do not change the meaning of the original word. So in "Every day I walk to school." and "Yesterday I walked to school.", the words walk and walked have the same basic meaning. In "I have one car." and "I have two cars.", the basic meaning of the words car and cars is exactly the same. In these cases, the suffix is added simply for grammatical "correctness". Look at these examples:

With derivational suffixes, the new word has a new meaning, and is usually a different part of speech. But the new meaning is related to the old meaning - it is "derived" from the old meaning.
We can add more than one suffix, as in this example:

There are several hundred derivational suffixes. Here are some of the more common ones:

Suffixes can add or change words' meaning in many different ways. Below you can find the List of most common and most popular suffixes with the description how they change the meaning of the original word and some examples: