Matter is everything that is surrounding us.
Anything that has an existence, due to which one can see & feel it directly, is called matter.

what's matter?

Matter can be identified by definite properties or behaviour. 
Balloons, footy & orange juice are all examples of matter having definite properties.
Matter is an entity that takes up space & occupies it. The amount of space occupied by any matter is called its volume.
Watch the dissimilarity in the levels of the pans of the weighing scale shown here
The inflated balloon has air in it & is therefore heavier than the deflated one.

Air is matter & matter has weight.
Observe that the ice sinks down by the force of the juice that’s being poured.
The force exerted by matter is called its pressure
Matter can be identified by definite properties: -
Matter is anything that
1) Has weight.
2) Occupies space &
3) Exerts pressure.
Now see the given link to know about types of matter.See this link to know about law of conservation of matter.

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