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Customers have different needs and wants, so every firm need to have the strategic marketing process to organize the allocation of its various marketing resources for reaching its target markets. Therefore, different companies will have characteristics of the customer segments. Market segmentation involves aggregating the prospective buyers into groups or segments which have common needs and will respond with a similar marketing strategy.
Notes:
1. Try my best to translate as I don't quite understand the following statement:
so every firm will have the strategic marketing process to organization allocates its marketing mix resources to reach its target markets.

As customers have different needs and wants, every firm needs to formulate itself the marketing strategic about the organization and allocation of the resources for its marketing mix so as to reach its target markets . Therefore, different companies will make different customer segments accoding to its characteristics . Market segmentation involves aggregating those prospective buyers who have similar needs or responds into groups or segments .

Hope this helps !

Customers have different demands, so every firm will have the strategic marketing process to allocate their marketing mix resources to reach its target markets. So, different company also will have characteristics of the customer segments. Market segmentation involves aggregating prospective buyers into groups or segments, that have common needs and will respond similarly to a marketing action.