Training to failure can have lot's of benefits: boosting your strength levels, pushing you through plateaus, and achieving a superb muscle pump.
By doing as many reps as possible with a given weight, you create an enormous opportunity and stimulus for growth. The objective is to encourage the most possible muscle growth by pumping the maximum amount of blood to your muscle.
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Tips for success
Training to failure is REWARDING but TOUGH! They are a great technique but not recommended for complete beginners.
Failure training can be anabolic if done sparingly, but it's catabolic if done too often.
Failure training shouldn't be used on every set of every exercise.
If you're new to training to failure, try adding it to the last set of an exercise and working up when you feel it's right.
Only use this technique on exercises that pose no risk of putting you in a difficult position. For example, heavy barbell squats without safety rails attached to the rack is a bad idea for training to muscle failure.
When training with this kind of intensity you need to ensure you get adequate rest. Allow your body to recover between sets.
Make sure you take sufficient full rest days if training to failure is something you do often.