A material being loaded in a) compression, b) tension, c)
shear.Uniaxial stress is expressed by
stress=F/A
where F is the force [N] acting on an area A [m2].
But we cannot compare stress with strength.

the difference between the stress and strength is............
stress= load/ area ( n/mm2) .. it denotes that the load x will act in 1 mm2 of area of a structure,
strength denotes that max. stress upto which the structure get failure.

Stress is the force per unit area, it depends on area of
structure, while
Strength is the resistance to maximum stress at the time of
failure, it does not depend on area...

Strength is an extrinsic property of the material. It is
derived outcome of heat treatment processes. It is a
function of grain size, No of slip planes within a grain
etc. Therefore strength defines capacity of a material to
carry loads.
Stress is an internal resistance/force per unit area in the
material, generated due to application of external force.
Incidently, both have same units as strength is also
measured by force/area.

Stress is a measure of the load applied to a sample
relative to a cross sectional area of the sample. Strength
is a quantification of the samples ability to carry a load.