My definition of "meditation" is rather broad. I assume this is an opportunity for us to realize our higher consciousness (or to realize our oneness with our higher consciousness) and releasing resistance.
Benefits and Techniques of Meditation
There are many benefits to meditation, which I see as a side effect or extras, rather than the main purpose of a complete guided meditation. However, many people are inspired to meditate because of benefits or perceived benefits, such as improved health, greater calmness, less sleep at night. Regular meditators are generally more attentive, aware, and calm.
Given my broad definition, you may be able to understand that I recognize the existence of hundreds of techniques and advocate a variety. Some are more supportive than others; some are more conducive to continuing a long term practice than others; some are easier to learn than others. A technique is mean to help you achieve a deeper meditation.
Guided Meditation: One Approach
One of the techniques I use with people is the "guided" meditation. Guided meditation is one in which the voice is used to guide the process. Sounds can be your own or someone else. Some people feel more relaxed or more clear as a result of the guidance and support of other sounds.
A soothing voice is more conducive to a meditative state than a harsh one. Simplicity is more helpful than complex words or complicated ideas. A slow pace, rather than a fast cadence, tends to foster greater depth. Regular practice is helpful for going deeper.