The form of an adjective that is used when comparing things. For example:
He is taller than me.
The comparative is formed in different ways according to the length of the base adjective:
 If it has one syllable, then the letters -er are added.
 If the word has three syllables or more, then the word ‘more’ is added before the adjective: more attractive.
 Words of two syllables vary: some add -er and some use ‘more’.
Some can do either, for example clever.
Thus use of ‘more’ and adding -er are alternatives. It is wrong to use both together (e.g. more better).
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